Sioux Falls Zoologists

"Persistence and determination alone are omnipotent!"

The mirror test is an experiment developed in 1970 by psychologist Gordon Gallup Jr. to determine whether an animal possesses the ability to recognize itself in a mirror. It is the primary indicator of self-awareness in non-human animals and marks entrance to the mirror stage by human children in developmental psychology. Animals that pass the mirror test are: Humans older than 18 mo, Chimpanzees, Bonobos, Orangutans, Gorillas, Bottlenose Dolphins, Orcas (Killer Whales), Elephants, and European Magpies. Others showing signs of self-awareness are Pigs, some Gibbons, Rhesus Macaques, Capuchin Monkeys, some Corvids (Crows & Ravens) and Pigeons w/training. (Sorry Kitty!)

The Intelligence of Chimps
(includes Chimpanzees, Bonobos, Orangutans, and Gorillas)
Chimpanzees are very much like humans,
smart, but often brutal and violent.

The mirror test is an experiment developed in 1970 by psychologist Gordon Gallup Jr. to determine whether an animal possesses the ability to recognize itself in a mirror. It is the primary indicator of self-awareness in non-human animals and marks entrance to the mirror stage by human children in developmental psychology. Animals that pass the mirror test are: Humans older than 18 mo, Chimpanzees, Bonobos, Orangutans, Gorillas, Bottlenose Dolphins, Orcas (Killer Whales), Elephants, and European Magpies. Others showing signs of self-awareness are Pigs, some Gibbons, Rhesus Macaques, Capuchin Monkeys, some Corvids (Crows & Ravens) and Pigeons w/training.

9-19-17 Tool-wielding monkeys push local shellfish to edge of extinction
Tool-wielding monkeys push local shellfish to edge of extinction
Long-tailed macaques on an island in Thailand are doing such a good job of cracking shellfish with stone tools, they are driving down their prey's numbers and body size. HUMANS aren’t the only primate to have pushed their prey towards extinction. Monkeys have also over-exploited animals for food. Long-tailed macaques forage for shellfish on islands off Thailand, then crack them open with stone tools. They target the largest rock oysters, bludgeoning them with stone hammers, and pry open the meatiest snail and crab shells with the flattened edges of their tools. These macaques are one of three primates that use stone tools, alongside chimpanzees in Africa and bearded capuchins in South America. “Stone tools open up an opportunity for foods they otherwise wouldn’t even be able to harvest,” says Lydia Luncz at the University of Oxford. Luncz wanted to investigate the impact of the monkeys’ shellfish snacking on the prey themselves. Her team followed 18 macaques on their daily foraging routes along the shores of Koram and NomSao, two neighbouring islands off eastern Thailand, recording their tool selection and use. On Koram – the more densely populated island, home to 80 macaques compared with NomSao’s nine – Luncz’s group saw not only smaller oysters and snails, but also fewer of each species. Multiple prey species were less abundant on Koram than NomSao, with four times as many tropical periwinkles on NomSao as on Koram (eLife, “It’s been shown that systematic predation causes prey of smaller size,” says Nathaniel Dominy at Dartmouth College in Hanover, New Hampshire. The oysters on Koram were about 70 per cent smaller than their counterparts on NomSao, and the periwinkles were less than half the size. A single tool-using monkey on Koram can eat over 40 shellfish a day, so Luncz’s group thinks this predation pressure is driving these shellfish changes.

9-4-17 It took these monkeys just 13 years to learn how to crack nuts
It took these monkeys just 13 years to learn how to crack nuts
The long-tailed macaques of Thailand already used stone hammers to split open shellfish, and now they have worked out how to use them to crack open nuts. The macaques of southern Thailand have started a new tradition. For at least a century, they have used simple stone tools to smash open shellfish on the seashore. Now the monkeys have begun using stones to crack open oil palm nuts further inland. The finding means they may be the first non-human primates to have begun adapting their Stone Age technology to exploit a new ecological niche. Tool use is common in the animal kingdom, but very few animals make routine use of stones as tools. Among non-human primates, just three species are known to do so: the western chimpanzees of West Africa, the bearded capuchins of Brazil and the long-tailed macaques of Thailand. However, in all three cases biologists thought the primates restricted their stone tool use to a specific environmental setting. “The chimpanzees live in tropical rainforest, and the capuchins in a dry savannah area,” says Lydia Luncz at the University of Oxford. And the macaques spend a lot of time on the beaches of Thailand’s islands, where they use stones to break into shellfish. But the macaques also roam inland. In 2016, Luncz and her colleagues trekked through Yao Noi Island into an abandoned oil palm plantation. They found what appeared to be stones that had been used as hammers and anvils associated with broken oil palm nuts.

8-26-17 Low-ranked female monkeys band together against their leaders
Low-ranked female monkeys band together against their leaders
Female rhesus macaques have a strict hierarchy, but the subordinates can buck authority and even climb the social ladder if they’re big enough and have enough friends. If you’re trying to overthrow the boss, you might need a friend to back you up. The same is true for female macaques, who need allies to resist authority and take down more powerful members of the group. Most primates have social hierarchies in which some individuals are dominant over the others. For rhesus macaques, these strict hierarchies are organised around female relationships. Lower-ranked females have little social mobility and must silently bare their teeth to higher-ranked females. The signal means “I want you to know that I know that you out-rank me” and is important in communicating social rank, says Darcy Hannibal at the University of California, Davis. “They are ‘bending the knee’.” But Hannibal and her colleagues have discovered that subordinate females can override the status quo. To do this, female macaques form alliances with family, friends or both. These alliances help females maintain or increase their social rank and compete for resources. A female who wants to challenge those higher up needs this help, says Hannibal. To find out what factors affect the rate of insubordination, the team studied 357 captive adult females, who experienced almost 11,000 conflicts. Insubordination events were more likely if the lower-ranked female was older. They were most likely if the subordinate outweighed the dominant female by 7 kilograms and the dominant female had no family allies. The more allies the subordinate female had, and the more days her mother was present in the group, the more often she would exhibit insubordinate behaviour.

8-18-17 Grown-up chimps are less likely to help distressed friends
Grown-up chimps are less likely to help distressed friends
Chimpanzees of all ages will comfort upset companions, but adult chimps do it less – perhaps because they are more selective about who they help. There, there! Adult chimpanzees are less likely than younger ones to console their companions in times of distress. The finding raises questions about how the capacity for empathy changes with age in our closest relatives – and us. When a chimpanzee gets upset, perhaps after losing a fight, companions will often sit with them and provide reassurance by kissing, grooming or embracing them. The same is true of young children. By age 2, children typically respond to a family member crying by consoling them in a similar way. We know chimpanzees have personalities: individual differences in their behaviour that are consistent over time. But it was unclear whether their empathetic tendencies are part of their personality, and whether they change over time. Christine Webb at Emory University in Atlanta, Georgia, and her colleagues wanted to find out. The team studied eight years of observations of a group of 44 chimpanzees at Yerkes National Primate Research Center, also in Georgia. They found that individual differences were consistent over their lifespan: chimps who consoled more in their youth, relative to their peers, also consoled more than their peers later in life. This is the first evidence that chimps have “empathetic personalities”, says Webb. But they also found that juvenile chimpanzees console others more than adults, and infants console most of all age groups.

8-16-17 Chimps can play rock-paper-scissors
Chimps can play rock-paper-scissors
Japanese researchers have taught chimps the rules of rock-paper-scissors.

8-10-17 Primate brains react differently to faces of friends and VIPs
Primate brains react differently to faces of friends and VIPs
Two newly identified brain areas reveal how rhesus macaques recognise the difference between intimately familiar faces and faces that the monkeys know less well. Two newly identified brain areas in rhesus monkeys seem to help the animals recognise familiar faces. Primates, Homo sapiens included, must be able to differentiate between faces and recognise friend from foe because social hierarchies play a large role in daily life. But exactly how primate brains deal with faces is not completely clear. One idea is that the same parts of the brain are involved in recognising both familiar and unfamiliar faces, just with varying efficiency. But Sofia Landi and Winrich Freiwald at Rockefeller University in New York have now cast doubt on that thinking. Their work shows that distinct brain areas are responsible for recognising the primates you know. Many researchers have already shown that certain areas of the temporal and prefrontal cortex are involved in unfamiliar face perception in rhesus monkey brains. Using whole-brain fMRI scans of four monkeys, Landi and Freiwald have now identified two additional brain areas that play a role not only in unfamiliar face perception but also in recognising familiar faces. The two new areas are in the anterior temporal lobe – the part of our brains above and in front of our ears. One is in the perirhinal cortex and one is in the temporal pole. These regions lit up far more when the monkeys recognised a familiar face in a photograph, as opposed to when they were presented with images of a stranger.

8-8-17 Chantek, the orangutan who used sign language, dies at 39
Chantek, the orangutan who used sign language, dies at 39
An orangutan who was one of the first apes to learn sign language has died in Atlanta, Georgia, aged 39. Chantek lived with an anthropologist in Tennessee for about nine years and learned to clean his room, make and use tools and memorise the route to a fast-food restaurant. He spent his later years in Zoo Atlanta where he was treated for heart disease. Zoo officials said he had "an engaging personality" and would be deeply missed. In a statement, Zoo Atlanta said that at 39, Chantek was one of the oldest male orangutans in North American zoos. His cause of death was not yet known, it said, but vets had been treating him for progressive heart disease. Orangutans are considered geriatric after the age of about 35, the zoo added. Chantek was born at the Yerkes National Primate Research Center in Georgia and was sent to live with anthropologist Lyn Miles at the University of Tennessee at Chattanooga. A 2014 documentary called "The Ape Who Went to College" showed that Chantek had learned various skills there including cleaning his room and directing a driving route from the university to a restaurant.

6-29-17 What Nemley Jr's death means for fight to protect chimps
What Nemley Jr's death means for fight to protect chimps
The death of the baby chimpanzee Nemley Jr, rescued from wildlife traffickers only to fade away in a zoo in Ivory Coast, has provoked outrage. And after a BBC investigation that lasted more than a year, those of us involved in the work are finding his loss upsetting and also incredibly frustrating. In the wild, infant chimps have a poor survival record. And youngsters rescued from traffickers have endured the trauma of losing their mothers and then being thrust into the unfamiliar world of humans, so many of them do not make it either. In his last few weeks, Nemley Jr was given intensive care and dedicated support, so who or what is to blame for his shocking demise, and how best to save endangered animals such as chimpanzees from extinction? This long and sad story involves the harsh economics of the black market, the corroding influence of corruption, and the impact on the natural world of the mass consumption of which we are all a part. Add to that an indifference to wildlife among some in West Africa that is bewildering to outsiders, and you have a context in which an infant chimp's chances are slim.

6-26-17 Chimps' strength secrets explained
Chimps' strength secrets explained
The greater strength of chimpanzees, relative to humans, may have been explained by American scientists. A study suggests the difference is mostly due to a higher proportion in chimps of a muscle fibre type involved in powerful, rapid movements. The findings do not support previous work suggesting mechanical aspects of chimp muscles are responsible. But the difference in chimp-human muscle performance is more modest than sometimes depicted in popular culture. In the 1920s, anecdotal evidence along with investigations by the biologist John Bauman, helped feed a perception that chimps were between four and eight times stronger than an adult human. But subsequent studies failed to replicate these figures, as later researchers found that chimps did not greatly outperform adult males when given physical tasks. Writing in PNAS journal, Dr Matthew C O'Neill, from the University of Arizona College of Medicine-Phoenix, and colleagues reviewed the literature on chimp muscle performance and found that, on average, they are 1.5 times more powerful than humans in pulling and jumping tasks.

6-26-17 Chimps are not as superhumanly strong as we thought they were
Chimps are not as superhumanly strong as we thought they were
We sacrificed strength for endurance after our split from other apes, but it turns out our muscles are only a third weaker than those of our ape cousins. Chimpanzees do have stronger muscles than us – but they are not nearly as powerful as many people think. “There’s this idea out there that chimpanzees are superhuman strong,” says Matthew O’Neill at the University of Arizona in Phoenix. Yet his team’s experiments and computer models show that a chimpanzee muscle is only about a third stronger than a human one of the same size. This result matches well with the few tests that have been done, which suggest that when it comes to pulling and jumping, chimps are about 1.5 times as strong as humans relative to their body mass. But because they are lighter than the average person, humans can actually outperform them in absolute terms, say O’Neill. His findings suggest that other apes have similar muscle strength to chimpanzees. “Humans are the odd ones,” he says. O’Neill’s team has been studying the evolution of upright walking. To create an accurate computer model of how chimps walk, the researchers needed to find out whether their muscles really are exceptionally strong. So they removed small samples of leg muscle from three chimps under general anaesthetic and measured the strength of individual fibres. The same procedure is used to study human muscles. Comparing the results with the many studies on those revealed that, contrary to the claims of several other studies, there is nothing special about chimp muscle. “Chimpanzee muscle is really no different than human muscle in terms of the force that individual fibres exert,” says O’Neill.

5-25-17 Monkey mafia steal your stuff, then sell it back for a cracker
Monkey mafia steal your stuff, then sell it back for a cracker
Long-tailed macaques living near an Indonesian temple have learned how to steal human possessions, including cash, and then trade them for food. Long-tailed macaques living near an Indonesian temple have figured out how to run a ransom racket on visiting tourists. The monkeys grab valuables, such as glasses, hats, cameras or, in one case, a wad of cash from the ticket booth, then wait for temple staff to offer them food before dropping their ill-gotten gains and dashing off with the tasty prize. Although this behaviour has been reported anecdotally at Uluwatu Temple on the island of Bali for years, it had never been studied scientifically in the wild. So Fany Brotcorne, a primatologist at the University of Liège in Belgium, and her colleagues set out to discover how and why it has spread through the monkey population. “It’s a unique behaviour. The Uluwatu Temple is the only place in Bali where it’s found,” she says, which suggests it is a learned behaviour rather than an innate ability. Brotcorne wanted to determine whether it was indeed cultural, which could help us better understand the monkey’s cognitive abilities, and even human evolution.

5-17-17 Orangutans take motherhood to extremes, nursing young for more than eight years
Orangutans take motherhood to extremes, nursing young for more than eight years
Weaning has been tricky to observe in the wild, so researchers turned to lab tests. A baby orangutan could guzzle its mom’s milk for more than eight years, the longest of any wild mammal on record. The supermoms of the mammal world are big, shy redheads. Studying growth layers in orangutan teeth shows that mothers can nurse their youngsters for eight-plus years, a record for wild mammals. Teeth from a museum specimen of a young Bornean orangutan (Pongo pygmaeus) don’t show signs of weaning until 8.1 years of age. And a Sumatran orangutan (P. abelii) was still nursing during the few months before it was killed at 8.8 years, researchers report May 17 in Science Advances. Tests also show that youngsters periodically start to taper off their dependence on their mother’s milk and then, perhaps if solid food grows scarce, go back to what looks like an all-mom diet. Such on-again, off-again nursing cycles aren’t known in other wild mammals, says study coauthor Tanya Smith, an evolutionary anthropologist at Griffith University in Nathan, Australia. (Webmaster's comment: Black women in Africa often nurse their children until they are 4 years old. Nursing serves as a prophylactic to help prevent them getting pregant again.)

4-26-17 Chimps pass on sponge drinking trick like a family tradition
Chimps pass on sponge drinking trick like a family tradition
After a few chimpanzees started using moss to soak up water from a pond, the behaviour has spread. The pattern might tell us about how early human culture spread. Six years ago, a chimpanzee had the bright idea to use moss to soak up water, then drink from it, and seven others soon learned the trick. Three years later, researchers returned to the site to see if the practice had persisted to become part of the local chimp culture. They now report that the technique has continued to spread, and it’s mostly been learned by relatives of the original moss-spongers. This adds to earlier evidence that family ties are the most important routes for culture to spread in animals. After the first report of chimps using moss as a sponge in Budongo Forest, Uganda, researchers rarely saw the behaviour again, and wondered whether chimps still knew how to do it. So they set up an experiment, providing moss and leaves at the clay pit where the chimps had demonstrated the technique before. Then they watched to see whether chimpanzees would use leaves – a more common behaviour – or moss to soak up the mineral-rich water from the pit. Most of the original moss-spongers used moss again during the experiment, and so did another 17 chimps, showing the practice had become more widespread. The researchers wondered what factors influenced which individuals adopted it: were they connected socially, or through families, for instance?

4-5-17 Apes can see things from your perspective and help you out
Apes can see things from your perspective and help you out
Chimps, bonobos and orangutans help humans when they look for objects in the wrong place - showing they can tell when others believe something that's false. Our closest evolutionary relatives are quite the mind readers. And they can use that knowledge to help people figure things out when they are labouring under a misapprehension, according to the latest research. The ability to attribute mental states to others, aka theory of mind, is sometimes considered unique to humans, but evidence is mounting that other animals have some capacity for it. In a study last year, chimps, bonobos and orangutans watched videos of people behaving in different scenarios as cameras tracked their eye movements. The experiment found that the apes looked where an actor in the video would expect to see an object, rather than towards its true location, suggesting the animals were aware others could hold false beliefs. But that experiment left open the possibility apes were simply predicting that the actor would go to the last place he’d seen the object, without understanding that he held a false belief. Now, David Buttelmann at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and colleagues tested 34 zoo chimpanzees, bonobos and orangutans, in search of more conclusive evidence.

3-29-17 Inside knowledge: What’s really going on in the minds of animals
Inside knowledge: What’s really going on in the minds of animals
Bright animals from chimps to crows know what they know and what others are thinking. But when it comes to abstract knowledge, the picture is more mixed. WORKERS at the David Sheldrick Wildlife Trust in Nairobi, Kenya, claim that elephants know they will be looked after at its rescue centre, even if the animals have never been there. Elephants that have had no contact with the centre, but know others who have, often turn up with injuries that need attention. That suggests not only abstract knowledge, but relatively sophisticated communication of that knowledge. Either that, or wishful thinking on our part. The extent to which non-human animals “know” things is difficult to assess. The attribute known as “theory of mind” – the ability to know what others are aware of – has been demonstrated, although not always conclusively, in elephants, chimps, parrots, dolphins and ravens, for example. Dolphins are even aware of lacking knowledge. Train a dolphin to answer a question such as “was that a high or low-frequency tone you just heard?” and they give sensible answers, even giving a “don’t know” when the right response isn’t clear. Some primates spontaneously seek further information when posed a question that they can’t answer, suggesting they know both that they don’t know and that they can change that. Things look more mixed when we consider abstract knowledge: the ability we have to understand abstract properties such as weight or force, and squirrel away knowledge gained in one situation to be applied in some future, different context. Great apes instinctively know that, of two identical cups on a seesaw, the lower one is more likely to contain food. “They have a spontaneous preference, from the first time, for the lower cup,” says Christoph Voelter, who researches animal cognition at the University of St Andrews, UK. “They seem to have certain physical knowledge about the world.” New Caledonian crows, on the other hand, don’t have this know-how and make “mistakes” when assessing which stones will exert the most force on a lever to release food. “Crows aren’t using knowledge of force when initially solving the problem,” says Alex Taylor of the University of Auckland, New Zealand – rather, they seem to use trial and error.

3-20-17 Parrots find ‘laughter’ contagious and high-five in mid air
Parrots find ‘laughter’ contagious and high-five in mid air
Chortling parrots join humans, apes and rats in elite club of species that find fun infectious and enjoy a laugh or two together. If your parrot is feeling glum, it might be tweetable. Wild keas spontaneously burst into playful behaviour when exposed to the parrot equivalent of canned laughter – the first birds known to respond to laughter-like sounds. The parrots soared after one another in aerobatic loops, exchanged foot-kicking high fives in mid-air and tossed objects to each other, in what seems to be emotionally contagious behaviour. And when the recording stops, so does the party, and the birds go back to whatever they had been doing. We already knew that these half-metre-tall parrots engage in playful behaviour, especially when young. What’s new is that a special warbling call they make has been shown to trigger behaviour that seems to be an equivalent of spontaneous, contagious laughter in humans. Moreover, it’s not just the young ones that respond, adults of both sexes join in the fun too. (Webmaster's comment: Humor is universal! In college I observed that lab rats are especially humorous and laugh, tease and play all the time.)

3-16-17 Chimp filmed cleaning a corpse’s teeth in a mortuary-like ritual
Chimp filmed cleaning a corpse’s teeth in a mortuary-like ritual
The never-before-seen behaviour suggests that chimpanzees can be curious about death and may shed light on the origins of human mortuary practices. For the first time, a chimpanzee has been observed using tools to clean the corpse of a deceased group member. This behaviour could shed light on the evolutionary origins of human mortuary practices. A female chimpanzee, Noel, at Chimfunshi Wildlife Orphanage Trust in Zambia sat down by the dead body of a young male, Thomas, whom she had previously adopted. She then selected a firm stem of grass, and started to intently remove debris from his teeth. She continued doing this even after the rest of the group had left the corpse. A team of scientists from the University of St Andrews, UK, who observed the behaviour think this could mean that the long-lasting social bonds that chimpanzees form continue to influence their behaviour even after their bonding partner has died. “The report is important because it indicates once more that the human species is not the only one capable of compassion,” says Edwin van Leeuwen, lead author of the study. It appears that chimps, like humans, treat deceased members of their own species sensitively, rather than treating them like inanimate objects – especially when the deceased is a close associate. “This is certainly an interesting and noteworthy observation, another case of chimpanzees showing unusual behaviour in the presence of deceased group members,” says Klaus Zuberbuehler, also at St Andrews, who wasn’t involved in the study. “We have seen similar behaviour in our wild group of chimps in Budongo forest, Uganda, where individuals groomed an adult female, who had just been killed, for an extended period of time.”

3-5-17 ‘Monkeytalk’ invites readers into the complex social world of monkeys
‘Monkeytalk’ invites readers into the complex social world of monkeys
Researcher shares stories of science and life in the field. In a new book, a primatologist discusses what’s known about intelligence and social behavior in several monkey species, including Barbary macaques. The social lives of macaques and baboons play out in what primatologist Julia Fischer calls “a magnificent opera.” When young Barbary macaques reach about 6 months, they fight nightly with their mothers. Young ones want the “maternal embrace” as they snooze; mothers want precious alone time. Getting pushed away and bitten by dear old mom doesn’t deter young macaques. But they’re on their own when a new brother or sister comes along. In Monkeytalk, Fischer describes how the monkey species she studies have evolved their own forms of intelligence and communication. Connections exist between monkey and human minds, but Fischer regards differences among primate species as particularly compelling. She connects lab studies of monkeys and apes to her observations of wild monkeys while mixing in offbeat personal anecdotes of life in the field. Fischer catapulted into a career chasing down monkeys in 1993. While still in college, she monitored captive Barbary macaques. That led to fieldwork among wild macaques in Morocco. In macaque communities, females hold central roles because young males move to other groups to mate. Members of closely related, cooperative female clans gain an edge in competing for status with male newcomers. Still, adult males typically outrank females. Fischer describes how the monkeys strategically alternate between attacking and forging alliances. (Webmaster's comment: Where it all started.)

2-9-17 Orangutan squeaks reveal language evolution, says study
Orangutan squeaks reveal language evolution, says study
Orangutan kiss squeaks could provide a glimpse of how our ancestors combined vowels and consonants to form the first words. Scientists who spent years listening to the communication calls of one of our closest ape relatives say their eavesdropping has shed light on the origin of human language. Dr Adriano Reis e Lameira from Durham University recorded and analysed almost 5,000 orangutan "kiss squeaks". He found that the animals combined these purse-lipped, "consonant-like" calls to convey different messages. This could be a glimpse of how our ancestors formed the earliest words. The findings are published in the journal Nature Human Behaviour.

2-5-17 The secret trade in baby chimps
The secret trade in baby chimps
A secret network of wildlife traffickers selling baby chimpanzees has been exposed by a year-long BBC News investigation. The tiny animals are seized from the wild and sold as pets. The BBC’s research uncovered a notorious West African hub for wildlife trafficking, known as the “blue room”, and led to the rescue of a one-year-old chimp. In a dusty back street of Abidjan, Ivory Coast’s largest city, a tiny chimpanzee cries out for comfort. His black hair is ruffled and his dirty nappy scrapes the concrete floor as he crawls towards the familiar figures of the men who have been holding him captive. The baby chimp, ripped away from his family in the wild, is the victim of a lucrative and brutal smuggling operation, exposed by a 12-month-long BBC News investigation spanning half a dozen countries. (Webmaster's comment: And once they grow up they are extremely dangerous and will try to dominate you and tear you face off. They can never be pets past childhold.)

1-30-17 Chimps beat up, murder and then cannibalise their former tyrant
Chimps beat up, murder and then cannibalise their former tyrant
A gang of chimps overthrew their alpha male, ostracised him for years and then killed him when he returned. It was a gruesome scene. The body had severe wounds and was still bleeding despite having been lying for a few hours in the hot Senegalese savanna. The murder victim, a West African chimpanzee called Foudouko, had been beaten with rocks and sticks, stomped on and then cannibalised by his own community. This is one of just nine known cases where a group of chimpanzees has killed one of their own adult males, as opposed to killing a member of a neighbouring tribe. These intragroup killings are rare, but Michael Wilson at the University of Minnesota says they are a valuable insight into chimp behaviour such as male coalition building. “Why do these coalitions sometimes succeed, but not very often? It’s at the heart of this tension between conflict and cooperation, which is central to the lives of chimpanzees and even to our own,” he says. Chimps usually live in groups with more adult females than males, but in the group with the murder it was the other way round. “When you reverse that and have almost two males per every female — that really intensifies the competition for reproduction. That seems to be a key factor here,” says Wilson. Jill Pruetz at Iowa State University, who has been studying this group of chimpanzees in south-eastern Senegal since 2001, agrees. She suggests that human influence may have caused this skewed gender ratio that is likely to have been behind this attack. In Senegal, female chimpanzees are poached to provide infants for the pet trade.

1-10-17 Primate tool-use: Chimpanzees make drinking sticks
Primate tool-use: Chimpanzees make drinking sticks
Researchers have used camera traps to film tool-use that is unique to chimpanzees in Ivory Coast. The footage revealed that the clever primates habitually make special water-dipping sticks - chewing the end of the stick to turn it into a soft, water-absorbing brush. Primate researchers examined the "dipping sticks" and concluded they were made specifically for drinking. The findings are reported in the American Journal of Primatology. Lead researcher Juan Lapuente, from the Comoe Chimpanzee Conservation Project, in Ivory Coast, explained that using similar brush-tipped sticks to dip into bees' nests for honey was common in chimpanzee populations across Africa. "But the use of brush-tipped sticks to dip for water is completely new and had never been described before," he told BBC News. "These chimps use especially long brush tips that they make specifically for water - much longer than those used for honey." The researchers tested the chimps' drinking sticks in an "absorption experiment", which showed that the particularly long brush-tips provided an advantage. "The longer the brush, the more water they collect," said Mr Lapuente.

1-6-17 Oxytocin surge before a fight helps chimps bond with their group
Oxytocin surge before a fight helps chimps bond with their group
A spike in the “cuddle hormone” helps chimp comrades bond for war with rival groups, and something similar seems to happen in humans. Is the fabled “cuddle hormone” really a “warmone”? Oxytocin levels surge in troops of chimpanzees preparing for conflict with rival groups to defend or expand their territory. The finding is at odds with the prevailing image of oxytocin as something that helps strengthen bonds between parent and infant, or foster friendships. But given its capacity to strengthen loyalty, oxytocin could also be a warmonger hormone that helps chimps galvanise and cooperate against a common enemy. Catherine Crockford of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and her colleagues monitored two rival groups of chimpanzees in the Taï National Park in Ivory Coast, each containing five males and five females, for prolonged periods between October 2013 and May 2015. Thanks to trust built up between the team and the chimps, the team could safely track and video the groups – even during conflict, observing at close quarters what was happening. Crucially, the team was also able to pipette up fresh samples from soil when chimps urinated.

12-15-16 Chimps look at behinds the way we look at faces
Chimps look at behinds the way we look at faces
Humans are really good at picking out faces. Our brains are so good at this that we even see faces in places they don’t exist — like Jesus on toast. Flip a face upside down, though, and the brain needs an extra moment to determine that, yes, that’s a face. This is known as the inversion effect. And a new study finds that we’re not the only species to demonstrate it: Chimps do, too. Only they do it with butts. And this says something about human evolution — but we’ll get to that in a bit. In 2008, Frans de Waal and Jennifer Pokorny of Emory University in Atlanta showed in an Ig Nobel–winning experiment that chimpanzees could recognize each other from their behinds — or at least photographs of them. The chimp rear, it turns out, conveys important information about sex and, in females, ovulation status. Both males and females pay attention to those signals, which are important in mating and competition.

12-9-16 Monkeys should be able to talk just like us – so why don’t they?
Monkeys should be able to talk just like us – so why don’t they?
There’s nothing anatomical stopping monkeys from making human-like sounds we could understand finds a new study, which suggests they lack the brains for it. Ooh, ooh, ooh, ee, ee, ee! Shouting monkeys may have more sophisticated vocal abilities than we give them credit for. It seems that the anatomy of their vocal tract is theoretically capable of producing the five basic vowel sounds on which most human languages are based – and these could be used to form intelligible sentences. The results add to a growing body of evidence that some monkeys and apes can mimic or generate rudimentary sounds needed for speech-like communication. “No one can say now that there’s a vocal anatomy problem with monkey speech,” says Asif Ghazanfar at Princeton University, and co-leader of the study team. “They have a speech-ready vocal anatomy, but not a speech-ready brain. Now we need to find out why the human but not the monkey brain can produce language.”

11-8-16 Old bonobos have bad eyesight — just like us
Old bonobos have bad eyesight — just like us
Older bonobos are longsighted — they have presbyopia — just like many older humans, a new study finds. It’s a familiar sight: Your mom or grandmother picks up a document and immediately holds it out at arm’s length to make out the small letters on the page, while simultaneously reaching for her reading glasses. As people age, their ability to see things close up often fades, a condition known as presbyopia. The eye can no longer focus light on the retina, focusing it instead just behind and causing poor close-up vision. Many have thought that presbyopia was a consequence of living in an era in which people are overburdened by tasks that require frequently focusing in the near-field of vision. But perhaps not: A new study finds that if bonobos could read, they too would need glasses as they age.

11-7-16 Middle-aged bonobos need reading glasses to groom their friends
Middle-aged bonobos need reading glasses to groom their friends
The eyesight of older bonobos appears to deteriorate at almost the same rate as in humans, implying that it’s a natural process, not lifestyle-related. If only they had “grooming glasses” they’d be fine. But in the absence of a pair of specs, ageing bonobos have been found to compensate for dodgy eyesight by focusing on fur that’s further away. The discovery of five cases of age-related long-sightedness at a bonobo colony in Wamba, Democratic Republic of the Congo, has demonstrated for the first time that ageing bonobos and humans develop poor eyesight at almost exactly the same rate. This suggests that it might be an unavoidable throwback to a common ancestor of apes and humans, rather than a result of too much staring at books and computer screens. The team inferred deteriorating eyesight from the increasing distance between the eyes of a bonobo and their grooming target as they got older. “I didn’t expect age to be such a strong predictor of long-sightedness,” says lead researcher, Heung Jin Ryu of the Primate Research Institute at Kyoto University, Japan. Nor did he expect the compensatory increa

10-19-16 Some of our Stone Age tools may just be crafty monkey throwaways
Some of our Stone Age tools may just be crafty monkey throwaways
Capuchins make stone flakes that could be mistaken for hominin tools, but they do so by accident in search of mineral dust they lick, perhaps as a medication. Toolmaking may not have been such a unique feat for our immediate ancestors after all – even modern monkeys have now been found to create stone tools. The surprising finding casts doubt on the assumption that intentional stone crafting required complex skills found only in hominins, such as changes in hand shape, coordination and cognitive skills. It also raises the possibility that at least some of the ancient tools we attribute to human ancestors were actually the handiwork of monkeys.

10-19-16 Wild monkeys throw curve at stone-tool making's origins
Wild monkeys throw curve at stone-tool making's origins
Unlike early hominids, capuchins don’t use sharp-edged rocks to dig or cut. A capuchin monkey in Brazil uses a handheld stone to hammer an embedded rock. Researchers say these wild primates unintentionally detach pieces of rock shaped like basic hominid stone tools, raising questions about how toolmaking evolved. A group of South American monkeys has rocked archaeologists’ assumptions about the origins of stone-tool making. Wild bearded capuchin monkeys in Brazil use handheld stones to whack rocks poking out of cliffs and outcrops. The animals unintentionally break off sharp-edged stones that resemble stone tools made by ancient members of the human evolutionary family, say archaeologist Tomos Proffitt of the University of Oxford and his colleagues. It’s the first observation of this hominid-like rock-fracturing ability in a nonhuman primate. The new finding indicates that early hominids needed no special mental ability, no fully opposable thumbs and not even any idea of what they were doing to get started as toolmakers, the researchers report October 19 in Nature. All it may have taken was a penchant for skillfully pounding rocks, as displayed by capuchins when cracking open nuts (SN Online: 4/30/15).

10-6-16 Chimps, bonobos and orangutans grasp how others view the world
Chimps, bonobos and orangutans grasp how others view the world
Apes’ ability to anticipate how a misinformed person will behave suggests they can see the world from the perspective of others – though maybe not consciously. Apes may be even more like us than we thought. They appear to anticipate that a person’s actions will follow his or her beliefs, even when they know the person is wrong – an ability never before demonstrated in non-human primates. The capacity to infer what others might be thinking, known as theory of mind, is central to what makes us human, and is reflected in the ways we cooperate and communicate, says Christopher Krupenye at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany. Humans, for example, possess an awareness of false beliefs held by other individuals, recognising that the thoughts of others don’t necessarily reflect reality. To see whether apes have this same type of awareness, Krupenye, Fumihiro Kano at Kyoto University in Japan, and their colleagues filmed scenarios designed to stimulate apes. The videos involve conflict between pairs of human actors, one of whom is dressed in a King Kong costume. “The apes are curious; they want to know what’s going on,” says Krupenye.

10-6-16 Chimps, other apes take mind reading to humanlike level
Chimps, other apes take mind reading to humanlike level
A group of captive apes, including this orangutan, performed tests indicating that they can grasp when others are about to act based on false beliefs. This finding indicates that social thinking skills of apes and humans are more alike than previously thought. Apes understand what others believe to be true. What’s more, they realize that those beliefs can be wrong, researchers say. To make this discovery, researchers devised experiments involving a concealed, gorilla-suited person or a squirreled-away rock that had been moved from their original hiding places — something the apes knew, but a person looking for King Kong or the stone didn’t. “Apes anticipated that an individual would search for an object where he last saw it, even though the apes knew that the object was no longer there,” says evolutionary anthropologist Christopher Krupenye. If this first-of-its-kind finding holds up, it means that chimpanzees, bonobos and orangutans can understand that others’ actions sometimes reflect mistaken assumptions about reality. Apes’ grasp of others’ false beliefs roughly equals that of human 2-year-olds tested in much the same way, say Krupenye of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and his colleagues.

9-5-16 Bonobos rival chimps at the art of cracking oil palm nuts
Bonobos rival chimps at the art of cracking oil palm nuts
Bonobos in an African sanctuary use stones to crack oil palm nuts surprisingly well, researchers say. These apes hold nut-cracking stones in 15 different ways, and use 10 hand grips not previously described for tool-using chimps or monkeys. Bonobos — chimpanzees’ sister species — don’t get the credit they deserve as tool users. Bonobos ranging through a sanctuary’s protected forests in the Democratic Republic of Congo crack nuts with stones nearly as well as wild chimps in other parts of Africa do, researchers report August 26 in the American Journal of Primatology. Wild bonobos have rarely been observed using any object as a tool and have never been reported to pound open nuts with stones. All 18 adult and adolescent bonobos tracked during April and May 2015 cracked oil palm nuts with stones of various sizes that researchers had placed near oil palm trees, says a team led by Johanna Neufuss of the University of Kent, England. Bonobos chose pounding stones well-suited to busting palm oil nutshells. These animals employed 15 grips to hold nut-cracking stones, including 10 grips not previously observed in nonhuman primates. Several novel grips involved holding a stone with the thumb and one or a few fingers while bracing the tool against the palm.

9-5-16 Eastern gorillas threatened with extinction
Eastern gorillas threatened with extinction
The eastern gorilla is now on the endangered species list. A surge in illegal hunting is threatening the eastern gorilla, the world's largest primate, an international conservation group has said. The International Union for Conservation of Nature (IUCN) Red List says just 5,000 of the animals remain in their central African habitat. The number of eastern gorillas has declined more than 70% in two decades. Four of the six great apes are now critically endangered, the IUCN says. This means they are just one step away from extinction.

8-11-16 Cherry or rhubarb? Orangutan mixes tasty cocktails in its mind
Cherry or rhubarb? Orangutan mixes tasty cocktails in its mind
A pleasure-seeking ape can predict the taste of cocktails it has never tried before, which was thought to be something only humans can do. What’s an orangutan’s favourite cocktail? By providing a captive orang-utan with its own personal cocktail bar, a group of researchers found that out, and in the process discovered that these great apes have a predictive ability thought to be unique to humans. Naong, a male orangutan based at a Swedish zoo, was offered three distinct-tasting fruit juices – cherry, rhubarb and lemon – as well as cider apple vinegar. Each was in a small bottle on a table adjacent to his cage, and which he could access using a straw. He learned their flavours, and also the flavour of every possible pairing of the liquids mixed for him by a personal bartender. The researchers found that Naong not only remembered the flavour of each combination, but could predict whether combinations he had never tasted before would taste pleasant.

7-27-16 Orangutan learns to mimic human conversation for the first time
Orangutan learns to mimic human conversation for the first time
‘Rocky’ the ginger ape has astonished experts by producing sounds similar to words, a feat that might help us study the evolutionary origins of human speech. An orangutan has shown an ability to emulate human speech for the first time — a feat that gets us closer to understanding how human speech first evolved from the communications of ancestral great apes. ‘Rocky’ the ginger ape has astonished experts by producing sounds similar to words in a “conversational context”. “This opens up the potential for us to learn more about the vocal capacities of early hominids that lived before the split between the orangutan and human lineages to see how the vocal system evolved towards full-blown speech in humans,” says lead researcher Adriano Lameria, from the University of Durham, UK.

7-27-16 Orangutan 'copies human speech'
Orangutan 'copies human speech'
An orangutan copying sounds made by researchers offers new clues to how human speech evolved, scientists say. Rocky mimicked more than 500 vowel-like noises, suggesting an ability to control his voice and make new sounds. It had been thought these great apes were unable to do this and, since human speech is a learned behaviour, it could not have originated from them. Study lead Dr Adriano Lameira said this "notion" could now be thrown "into the trash can". Dr Lameira, who conducted the research at Amsterdam University prior to joining Durham University, said Rocky's responses had been "extremely accurate".

7-22-16 Monkeys who use tools
Monkeys who use tools
Wild capuchin monkeys in Brazil have used stone tools to prepare their food for at least 700 years, new research reveals. Archaeologists discovered dozens of stone hammers and anvils in Brazil’s Serra da Capivara National Park—the oldest known tools not belonging to either humans or chimpanzees. Operating carefully so as not to strike their own fingers, the monkeys use smaller stones as hammers to crack open cashew nuts on a heavier, flat stone; when they’re done eating the protein-rich nutmeats, they store their tools in nearby caches for future use, like a set of utensils at a restaurant. Scientists observed older monkeys teaching their youngsters how to use the stones.

7-19-16 Well-travelled chimps more likely to pick up tools and innovate
Well-travelled chimps more likely to pick up tools and innovate
What makes some apes pick up tools and others not has perplexed scientists, but hunger brought on by travel appears to be a big motivator. Spot a tool-using chimpanzee in Uganda’s Budongo Forest, and you could probably say it’s come a long way – in more ways than one. Chimps here are more likely to make use of tools to gather food if they have used up precious energy reserves travelling in the previous week. The finding suggests that balancing energy needs might push apes into experimenting with tools, with possible implications for understanding what drove our ancestors to develop technology. One explanation of tool use in animals is that it starts by chance and then spreads through a population by social learning. An alternative view is that ecological factors nudge animals into trying tools, with two main theories of how it happens. One is that animals may be forced to try out tool use to exploit new food sources when they are low on energy – if their preferred foods are in short supply, for instance. The other is that animals may be tempted into innovating after encountering new foods that they can only access with tools.

7-13-16 Gorillas may have evolved a way to beat a cheating berry plant
Gorillas may have evolved a way to beat a cheating berry plant
A "deceitful" West African plant makes super-sweet, but low-calorie berries to attract animals that disperse their seeds. Gorillas can see through the ploy – at least, that’s the theory. Fool me once, perhaps… it looks like gorillas don’t get fooled twice, at least not by a cheating plant. If true, that makes them smarter than humans and almost 50 other primate species all of whom can be tricked by a West African plant that grows super-sweet but low-calorie berries. Pentadiplandra brazzeana’s fruit is packed with a protein called brazzein, which mimics the taste of high-energy sugary fruits, but costs the plant less to make. So sweet is brazzein that it’s even been suggested as a new artificial sweetener for human consumption. The problem for hungry primates is that it’s mostly a waste of time eating the plant’s fruit. Brenda Bradley, an anthropologist at George Washington University, thinks the plant is probably producing cheap, sweet proteins to “trick” African primates into eating the low-calorie berries and dispersing their seeds.

7-11-16 Capuchin monkeys may have taught us how to eat cashew nuts
Capuchin monkeys may have taught us how to eat cashew nuts
Stones found in Brazil seem to be nutcrackers used by monkeys hundreds of years ago, hinting that human settlers could have copied them to enjoy the nuts. They are literally a tough nut to crack. To enjoy tasty cashews you first have to figure out a way to remove the shells, which contain a caustic chemical. The bearded capuchin monkeys of Brazil may have been up to the task for centuries – and watching them work could even have taught us how to eat cashew nuts safely. We know that at least three non-human primates use stone tools: chimpanzees in West Africa, long-tailed macaques in Thailand and bearded capuchins in Brazil. The first ever “primate archaeology” dig – carried out in Ivory Coast and published in 2007 – confirmed that chimpanzees have been living through their Stone Age for at least 4300 years. A similar investigation in Thailand published earlier this year traced back the macaque Stone Age at least 65 years.

7-11-16 Earliest evidence of monkeys’ use of stone tools found
Earliest evidence of monkeys’ use of stone tools found
Capuchins in Brazil used flat ‘anvils’ and round ‘hammers’ to smash nuts at least 600 years ago. Using tools is very old monkey business. Capuchins in northeast Brazil have wielded stones to crack open cashew nuts for 600 to 700 years, researchers report July 11 in Current Biology. Unearthed “hammers” and “anvils” are the earliest evidence of monkey tool use to date. Today, Brazilian bearded capuchin monkeys (Sapajus libidinosus) still open cashews by placing them on the flat surfaces of anvil rocks and pounding the nuts with large stones. Unlike pebbles and other rocks, the tool stones are distinctively heavy, blemished with wear marks, greased with cashew residue and clustered under cashew trees, Michael Haslam of the University of Oxford and colleagues found.

7-11-16 Monkey archaeology: Ancient evidence of tool use found
Monkey archaeology: Ancient evidence of tool use found
Primate archaeology is a new and unusual-sounding field, but it has revealed ancient evidence of some clever and dextrous monkey culture. Researchers from Oxford University, working in Brazil, found ancient "nut-cracking tools" - 700-year-old stone hammers that capuchin monkeys used to open cashew nuts. This is the earliest evidence yet of monkey tool use outside Africa.

7-10-16 Documentary looks for meaning in Koko the gorilla’s life
Documentary looks for meaning in Koko the gorilla’s life
Film focuses on ape’s relationship with researcher. For the last four decades, Koko, the world’s most famous gorilla, has lived in a trailer in Silicon Valley, the subject of the longest-running project on ape sign language. With a reported vocabulary of hundreds of signs, Koko has appeared to express feelings almost anyone can relate to — a love of kittens, a desire to be a mother. A new PBS documentary argues that Koko’s remarkable life “challenges what it is that makes humans unique.” The problem, though, is that the film never really makes clear what “it” is. Rather than diving into the question of ape language and dissecting Koko’s abilities, Koko — The Gorilla Who Talks focuses more on the relationship between Koko and researcher Penny Patterson. (Webmaster's comment: The first article on Koko in a 1978 issue of National Geographic began my long journey learning about animal intelligence. I still have that issue with "Conversations with a Gorilla". It had a significant influence on my life. Back issues are still available at National Geographic's website.)

6-10-16 ‘Monkey archaeology’ reveals macaque’s own Stone Age culture
‘Monkey archaeology’ reveals macaque’s own Stone Age culture
One of the first digs searching for stone tools used by monkeys has unearthed evidence that promises to change the way we study the evolution of tool use. The world’s first archaeology dig of an old world monkey culture has uncovered the tools used by previous generations of wild macaques – a group of primates separated from humans by some 25 million years of evolution. The discovery means humans aren’t unique in leaving a record of our past culture that can be pried open through archaeology. Only a few decades ago scientists thought that humans were the only species to have worked out how to turn objects in their environment into useful tools. We now know all sorts of animals can do the same – but the tools of choice are usually perishable materials like leafs and twigs. This makes the origin of these behaviours difficult to study, especially when you consider that the record of hominin stone tool use stretches back more than 3 million years. Burmese long-tailed macaques are a rare exception. They are renowned for their use of stone tools to crack open shellfish, crabs and nuts, making them one of the very few primates that have followed hominins into the Stone Age. (Webmaster's comment: The similar first primitive stone tools made by our hominin ancestors were made 3.3 million years ago.)

5-31-16 Are Gorillas A Danger To People?
Are Gorillas A Danger To People?
In the wake of the tragic killing of Harambe the gorilla, we explore the evidence for whether these great apes pose a danger to people. However, from the 1970s onwards the primatologist Dian Fossey transformed gorillas' reputation with her pioneering studies of wild mountain gorillas. These are a different species to Harambe, but the differences are subtle. Fossey found that the gorillas were hardly ever violent. For the most part they were peaceful. David Attenborough was filmed with some of Fossey's gorillas for the 1979 television series Life on Earth. The encounter has gone down in television history, because some of the young gorillas started playing with Attenborough. (Webmaster's comment: It's PEOPLE that are dangerous to Gorillas! 100's are killed for meat and body parts every year in Africa! No child has ever died that fell into a Gorilla enclosure. The Gorillas even protect them.)

5-23-16 Monkey seen caring for dying mate then grieving after she dies
Monkey seen caring for dying mate then grieving after she dies
It’s a tear-jerker worthy of Hollywood – and one of the first examples of compassionate care and grief in a wild monkey. The alpha male of a group of snub-nosed monkeys and his dying partner spent a final, tender hour together beneath the tree from which she had fallen minutes earlier, cracking her head on a rock. Before she succumbed, he gently touched and groomed her. And after she was dead he remained by her side for 5 minutes, touching her and pulling gently at her hand, as if to try and revive her (for a full account of what happened, see “A monkey tends to his dying mate – as it unfolded”). “The case we’ve reported is particularly important because of the exclusively gentle nature of the interactions, and the special treatment of the dying female shown by the adult male,” says James Anderson of Kyoto University, Japan. “The events suggest that in the case of strongly bonded individuals at least, monkeys may show compassionate behaviour to ailing or dying individuals.” The study follows a recent report of a quasi-funeral for an adult captive chimpanzee at a sanctuary in north-west Zambia, and evidence of death-related behaviour in crows. Together, the reports add to evidence that humans may not be the only species to display grieving behaviour following bereavement, or to show respect for dead individuals with whom they have forged ties. They also hint that animals have some recognition of the finality of death. (Webmaster's comment: All of us animals share a common ancestry so we all share many of the same emotions and values and much of the same understanding of how nature works.)

5-18-16 Chimps filmed grieving for dead friend
Chimps filmed grieving for dead friend
An extraordinary film reveals never-before-seen behaviour. A unique, remarkable and intimate film may change the way we think about animals, and their ability to feel grief. The newly-published film captures the solemn reactions of a group of chimpanzees who discover the dead body of a friend. For 20 minutes, the chimpanzees quietly gather around their friend, despite offers of food to tempt them away. They gently touch and sniff his body, with chimps who were closer friends with the deceased appearing to be the most upset. An older female chimp then attends to the dead ape, tenderly attempting to clean his teeth with a stem of grass.

3-31-16 How do you bring up a baby gorilla?
How do you bring up a baby gorilla?
A baby gorilla who was born by caesarean section, is being cared for by humans until she can be reunited with her mother at Bristol Zoo. Lynsey Bugg, who is the Curator of Mammals at the zoo, said the gorilla - who has been named Afia - was getting "stronger by the day". She also described what it was like bringing up a baby gorilla at home with her family.

3-4-16 What do chimp ‘temples’ tell us about the evolution of religion?
What do chimp ‘temples’ tell us about the evolution of religion?
Biologists working in the Republic of Guinea have found evidence for an apparent "sacred tree" used by chimps, perhaps for some sort of ritual. All hail the sacred tree. I’ve often wondered aloud in the newsroom about the possibility of finding evidence of a chimp shrine, the discovery of a place where chimps pray to their deity. Biologists working in the Republic of Guinea found evidence for what seemed to be a “sacred tree” used by chimps, perhaps for some sort of ritual. Laura Kehoe of the Humboldt University of Berlin, Germany, set up camera traps by trees marked with unusual scratches. What she found gave her goosebumps: chimps were placing stones in the hollow of trees, and bashing trees with rocks. The behaviour could be a means of communication, since rocks make a loud bang when they hit hollow trees. Or it could be more symbolic. “Maybe we found the first evidence of chimpanzees creating a kind of shrine that could indicate sacred trees.”

2-26-16 Bromance helps stressed out warring chimps keep their cool
Bromance helps stressed out warring chimps keep their cool
Strong friendships in primates may have evolved to counteract the damaging health effects of living in complex social groups. When it comes to warfare, chimps are a bit like the ancient Greeks. They like to head into battle with a close friend at their side – a tactic that seems to lower their stress. Many primate species, including macaques and baboons, form strong, long-lasting social bonds with particular individuals that resemble human friendship. These relationships appear to benefit both males and females: they are associated with higher reproductive success and even longer life. In male chimps these bonds can seem surprising, given that adult males are extremely aggressive, sometimes killing each other. “Chimpanzees are highly territorial and encounters with neighbouring groups tend to be very hostile and can be deadly,” said Catherine Crockford of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, last week at the Ethological Society annual meeting in Göttingen. Yet pairs of strongly bonded males also engage in relaxed, cooperative behaviours, including sharing food and grooming vulnerable, intimate areas, such as genitalia.

2-24-16 Wild gorillas compose happy songs that they hum during meals
Wild gorillas compose happy songs that they hum during meals
Humming their individual songs may be a way for gorillas to communicate dinner times and contentment with their meals. Gorillas sing and hum when eating, a discovery that could help shed light on how language evolved in early humans. Singing seems to be a way for gorillas to express contentment with their meal, as well as for the head of the family to communicate to others that it is dinner time. Food-related calls have been documented in many animals, including chimpanzees and bonobos, but aside from anecdotal reports from zoos, there was no evidence of it in gorillas. To see if they make these noises in the wild, Eva Luef, a primatologist at the Max Planck Institute for Ornithology in Seewiesen, Germany, observed two groups of wild western lowland gorillas in the Republic of the Congo. Luef identified two different types of sound that the gorillas sometimes made when eating. One of them was humming – a steady low-frequency tone that sounds a bit like a sigh of contentment.

2-8-16 How do you prepare orangutans to go back into the wild?
How do you prepare orangutans to go back into the wild?
The school that teaches orangutans. Orangutans living at a sanctuary in Indonesia are being prepared for release back into the wild. Forest fires and poaching have led to a decrease in the population. International Animal Rescue has more than 100 at its sanctuary in Ketapang in western Kaliman province. Rehabilitation can take up to eight years.

2-4-16 First orangutan murder seen as pair team up to kill female
First orangutan murder seen as pair team up to kill female
Orangutans are normally solitary, only coming together to mate. But violence could increase as they are forced closer together by habitat destruction. It was a deadly rumble in the jungle. A female orangutan was attacked and killed by another female and a male – the first time lethal aggression has been seen in the species. Female orangutans are normally solitary, and very rarely engage in fights. It’s also unusual for females and males to form coalitions. In this case, Kondor, a young female, and Ekko, her suitor, beat and bit an older female named Sidony in the swamp forests of Indonesia’s Mawas Reserve. Sidony sustained serious wounds that became infected, and she died two weeks later.

1-18-16 How to make friends with wild gorillas
How to make friends with wild gorillas
Grauer’s gorillas are the largest primates in the world and are capable of awesome displays of power and brute strength. But a harmonious family life lies at the heart of society for these elusive and threatened giants. Wildlife cameraman and presenter Gordon Buchanan tells BBC Earth how he attempted to get to know a population of the great apes living deep in a forest in the Democratic Republic of Congo.

11-3-15 Debate over chimpanzee 'accent' study
Debate over chimpanzee 'accent' study
A debate is unfolding among primatologists about a study, published in February, which reported that chimpanzees can adapt their grunts to communicate with new neighbours. It was based on a group of chimps that moved from a Dutch safari park to Edinburgh Zoo. Now, three researchers have written to the journal Current Biology suggesting the results don't stack up. The original team has responded, and stands by its findings and conclusions.

10-9-15 Squirrel monkeys teach themselves to eat and drink from a cup
Squirrel monkeys teach themselves to eat and drink from a cup
Tool use seemed so rare in squirrel monkeys that they were considered incapable of such feats, now they've been seen carrying food and water in containers. It’s not exactly the height of good etiquette, but squirrel monkeys at a research facility in California have learned how to eat and drink from plastic cup-like objects. It’s the first time squirrel monkeys have been observed carrying food and water around in containers, and a large number of the animals learned how to do it – 39 out of 57. Previously, reports of tool use in squirrel monkeys have been so rare that they were considered incapable of such a feat. The only other non-human primates that seem able to spontaneously begin using containers are captive chimpanzees, orangutans and capuchin monkeys. In the wild, capuchins and chimpanzees have been seen using leaves to access water from tree cavities.

10-1-15 The birds that fear death
The birds that fear death
Crows will gather around their dead. And the reasons why are intriguing. Crows are now the latest in the small group of animals that are known to recognise, or perhaps even mourn their dead. Elephants, giraffes, chimpanzees and several other corvid species are also known to loiter near recently deceased mates.

9-18-15 The inner lives of animals
The inner lives of animals
The evidence shows that elephants and apes mourn their dead, becoming listless and depressed. Dolphins can recognize their own reflections, have intricate social structures, and appear to call each other by individual names. Apes and chimps make tools, plan for the future, and display empathy and inferential reasoning. Primatologist Frans de Waal, writing in The New York Times about the recent discovery of a hominin ancestor with both human and ape characteristics, blames human vanity for the belief we are separate and distinct from the "extended family" of creatures on the great continuum of evolution. "The wall between human and animal cognition," de Waal says, "is like a Swiss cheese." If you doubt our kinship with the animal kingdom, I refer you to the daily news coverage of our species' Darwinian struggles for dominance and survival. Evolution is a work in progress: We are still closer to the beasts than to the gods.

9-18-15 Apes remember major events in movies, even on a single viewing
Apes remember major events in movies, even on a single viewing
The first evidence that chimpanzees and bonobos can recall recent events comes from experiments that tested their memory of short movie clips. We all have our favourite movie moments, ones we love to watch again from time to time. Now it seems chimpanzees and bonobos, too, have the nous to recall thrilling scenes in movies they have previously seen and anticipate when they are about to come up. The results suggest apes can readily recall and anticipate significant recent events, just by watching those events once. (Webmaster's comment: Dah! If members of an animal species didn't remember major events in their lives after one occurrance they would not have survived. They would all be extinct pretty quickly.)

8-4-15 Bonobo squeaks hint at earlier speech evolution
Bonobo squeaks hint at earlier speech evolution
Wild bonobos use a single high-pitched call in a variety of contexts, showing a flexibility in their communication that was thought to be uniquely human. Bonobos are just as closely related to humans as chimpanzees, but their wild communication is much less studied. Researchers say the new findings push back the development of context-free vocal calls to our shared ancestor with bonobos, 6-10 million years ago.

7-7-15 Bonobos use a range of tools like stone-age humans
Bonobos use a range of tools like stone-age humans
The chimps' randy relatives have been seen using tools as shovels and levers in captivity, and even fashioning a spear to jab at a researcher. Bonobos can be just as handy as chimpanzees. In fact, bonobos' tool-using abilities look a lot like those of early humans, suggesting that observing them could teach anthropologists about how our own ancestors evolved such skills.

6-10-15 Cheers! Chimps' favourite tipple is sweet palm wine
Cheers! Chimps' favourite tipple is sweet palm wine
Chimps in Guinea seem to get tipsy on the booze they find at the bottom of raffia palms, in the first study of the drinking habits of wild chimpanzees. In the first study of its kind, chimps in West Africa were spotted sampling sweet palm wine on a rare but habitual basis.

6-10-15 Chimpanzees found to drink alcoholic plant sap in wild
Chimpanzees found to drink alcoholic plant sap in wild
They have shown an understanding of language and a sense of fairness, and now humans' closest primate cousins have even been found to share a taste for alcohol. Scientists studying chimpanzees in Guinea have seen evidence of long-term and recurrent ingestion of ethanol by apes. The 17-year study recorded chimps using leaves to drink fermented palm sap. Some drank enough alcohol to produce "visible signs of inebriation".

6-2-15 Listening to the language of apes
Listening to the language of apes
The similarities between apes and people have long fascinated scientists. Yet, writes Mary Colwell, the differences can be just as thrilling. "The sounds uttered by these apes have all the characteristics of true speech," wrote Garner. "The speaker is conscious of the meaning of the sound used, and uses it with the definite purpose of conveying an idea to the one addressed; the sound is always addressed to some definite one, and the speaker usually looks at the one addressed; he regulates the pitch and volume of the voice to suit the condition under which it is used; he knows the value of sound as a medium of thought. These and many other facts show that they are truly speech."

5-18-15 In U.S., more say animals should have same rights as people
In U.S., more say animals should have same rights as people
Almost a third of Americans, 32%, believe animals should be given the same rights as people, while 62% say they deserve some protection but can still be used for the benefit of humans. The strong animal rights view is up from 2008 when 25% thought animals' rights should be on par with humans'. (Webmaster's comment: We need to keep in mind that an animal has little concept of human rights. A lion that eats you is just being a lion, and a chimpanzee that tears your face off to dominate you is just being a chimpanzee.)

5-6-15 Capuchin monkeys rival chimps as highly skilled nut-crackers
Capuchin monkeys rival chimps as highly skilled nut-crackers
Monkeys observed in Brazil can use tools, but they also know it doesn't take a sledgehammer to crack a nut – instead they exercise judgement and restraint. CAPUCHIN monkeys from Brazil are famous for using hammers and anvils to crack open tasty nuts. Now it seems they do so with even more skill and judgement then we gave them credit for, rivalling skills of their brainy chimp relatives. (Webmaster's comment: They are THINKING about the best way to get the food. Exactly what you would expect of any intelligent animal, which is almost all, if not all, of them.)

4-30-15 Capuchin monkeys rival chimps as highly skilled nut-crackers
Capuchin monkeys rival chimps as highly skilled nut-crackers
Monkeys are more skilful in using tools to crack open their favourite nuts than we thought. In addition to breaking nuts open with stones and copying more experienced individuals, they exercise a great deal of judgement to optimise each nut-cracking operation. Bearded capuchin monkeys from Brazil use tools made of quartz, limestone, sandstone and wood as anvils and hammers to crack open various nuts, and young monkeys observe how the older, more proficient and dominant individuals do it before they pick up the skill.

4-17-15 Wild chimps look both ways before crossing roads
Wild chimps look both ways before crossing roads
A busy highway in Uganda is a potential death trap, but chimps have learned to look before running across, and they even wait for those less able to cross. It turns out that like us wild chimpanzees learn to respect roads, adopting the same cautious drills as humans, including looking both ways to check for traffic.

3-19-15 Orangutans cup their mouths to alter their voices
Orangutans cup their mouths to alter their voices
Orangutans use their hands to alter their voices and make themselves sound bigger, say scientists. Researchers have now studied the acoustics of these "hand-modified kiss squeaks" and shown that the animals sound bigger and "more impressive" when they use their hands in the call.

2-5-15 Chimps 'learn local grunts' to talk to new neighbours
Chimps 'learn local grunts' to talk to new neighbours
Chimpanzees can change their grunts to communicate better with new companions, according to a study of two groups that were housed together in Edinburgh.

10-22-14 Chimps filmed raiding farms to find food
Chimps filmed raiding farms to find food
Camera traps have caught wild chimpanzees in the act as they carried out night-time raids on farmland. The footage, captured by researchers from the Museum of Natural History in Paris and the Uganda Wildlife Authority, shows the chimps adapting to human pressure on their habitat.

10-8-14 The battle to make Tommy the chimp a person
The battle to make Tommy the chimp a person
Tommy is 26. He lives alone behind a trailer sales park in upstate New York. His hobbies include watching cartoons. A lawsuit submitted by a group called the Nonhuman Rights Project (NhRP) seeks to have Tommy recognised as a person under law. (Webmaster's comment: Adult male chimps are very dangerous and will severly harm or kill you if they live with you. They are just being male chimps. They have no concept of your rights whatsover. Charging them with a crime would be like charging a 2 year old. Giving them human rights makes no sense.)

10-1-14 Chimps with tools: Wild ape culture caught on camera
Chimps with tools: Wild ape culture caught on camera
Researchers have captured the spread of a new type of tool use in a wild population of chimps. As the team filmed the animals at a field station in Uganda, they noticed that some of them started to make a new type of leaf sponge - something the animals use to drink. This new behaviour soon spread throughout the group. (Webmaster's comment: But they have yet been observed to chip-shape a rock like early primate humans first did 2.7 million years ago. A million years from now what evolves from chimps may also evolve the mental ability to do that.)

9-30-14 Chimp social network shows how new ideas catch on
Chimp social network shows how new ideas catch on
Three years ago, an adult chimpanzee called Nick dipped a piece of moss into a watering hole in Uganda's Budongo Forest. Watched by a female, Nambi, he lifted the moss to his mouth and squeezed the water out. Nambi copied him and, over the next six days, moss sponging began to spread through the community. A chimp trend was born.

9-18-14 Murder 'comes naturally' to chimpanzees
Murder 'comes naturally' to chimpanzees
A major study suggests that killing among chimpanzees results from normal competition, not human interference. Apart from humans, chimpanzees are the only primates known to gang up on their neighbours with lethal results. Murder rates in different chimp communities simply reflect the numerical make-up of the local population.

9-10-14 Fish that picks its work partners wisely
Fish that picks its work partners wisely
TO COOPERATE or not, that is the question, and trout know the answer. Coral trout have joined the exclusive club of species, including humans and chimps, that can decide whether to work with animals of another species on a task.

7-11-14 How much science is there in new Planet of the Apes film?
How much science is there in new Planet of the Apes film?
The latest instalment in the Planet of the Apes film franchise opens in the US on Friday. The rubber masks of the 60s and 70s films have been discarded in favour of motion capture suits and CGI. But how much did science inform the new movie's portrayal of our close relatives? (Webmaster's comment: Frans De Waal compares the film's ape behavior with real life ape behavior. The film gets much of it wrong but the comparison is educational.)

7-10-14 Chimpanzee brain power is strongly heritable
Chimpanzee brain power is strongly heritable
If a chimpanzee appears unusually intelligent, it probably had bright parents. That's the message from the first study to check if chimp brain power is heritable

7-3-14 Chimpanzee language: Communication gestures translated
Chimpanzee language: Communication gestures translated
Researchers say they have translated the meaning of gestures that wild chimpanzees use to communicate.

5-7-14 Only known chimp war reveals how societies splinter
Only known chimp war reveals how societies splinter
A weak leader is struggling to hold onto power as ambitious upstarts plot to take over. As tensions rise, the community splits and the killing begins. The war will last for years. No, this isn’t the storyline of an HBO fantasy drama, but real events involving chimps in Tanzania’s Gombe Stream National Park. A look at the social fragmentation that led to a four-year war in the 1970s now reveals similarities between the ways chimpanzee and human societies break down.

10-14-13 Apes comfort each other 'like humans'
Apes comfort each other 'like humans'
Young bonobos that are more "socially competent" are more likely to cuddle and calm other apes that are in distress, research has revealed.

12-7-07 Animals Do the Cleverest Things
Animals Do the Cleverest Things
The chimp who outwits humans; the dolphin who says it with seaweed; the existential dog -- the more we learn about other animals the harder it is to say we're the smartest species.

10-31-06 Elephants' jumbo mirror ability
Elephants' jumbo mirror ability
Elephants can recognize their own reflection, showing self-awareness seen before only in humans, great apes and bottlenose dolphins, scientists say.

Ape Genius

Mountain Gorilla - Meet the Legend

Inside Animal Minds - Article in National Geographic: Orangutan: Shows cognitive complexity and flexibility rivaling that of chimps; the species maintains cultural traditions in the wild. Bonobo: Acquired language spontaneously; makes tools at level of early humans.

Bonobo - The Forgotten Ape

Bonobo Handshake - A memoir of love and adventure in the Congo

The Bonobo and the Atheist - In Search of Humanism Among the Primates

Ape House - Bonobos and Humans Share 98.7 Percent of Their DNA

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The Intelligence of Chimps
Chimpanzees are very much like humans,
smart, but often brutal and violent.