The World of Insects Movies
Endorsed by Sioux Falls Zoologists
Sioux Falls Zoologists recommends the following documentaries that describe the world of insects and their behavior.
Insects have been around for 400 million years. They also were once quite large. Dragonflies once had a wingspan of over 2 feet. Their individual intelligence isn't much to speak of, but they do exhibit swarm intelligence (see Gathering Swarms ) which has obviously been incorporated in their genetics.
Bees seem to be on the high end of insect intelligence. They communicate locations using fairly complicated "waggle" dances and seem to "vote" on where to locate new hives. It's amazing what 40 million years of evolution (or more) can incorporate in a species' genetics.
The movies are all available from Amazon.com but you are free to obtain them from many other sources. Amazon offers them on their website along with many alternate sources, often less expensive. Many are probably also available on NetFlix.com and elsewhere for online viewing. You are free to choose whatever source you please. The movie links provided on the following pages point to the movie location at Amazon.
Documentaries on Insect behavior, including Butterfly and Bee behavior, are described on the following 7 pages:
2-21-20 Bumblebees in dire trouble
Climate change is pushing the much-loved bumblebee to the brink of extinction, new research has found. The fuzzy, buzzy insects are among the most important pollinators in the Northern Hemisphere, helping to spread pollen and fertilize many wild plants, as well as important crops such as tomatoes, blueberries, and squash. But their numbers have been dropping for years, and to understand why, scientists looked at a database of 550,000 records detailing where the bees have been spotted since 1901. It showed that bumblebee populations had crashed by 46 percent in North America and by 17 percent across Europe in recent years when compared with the base period of 1901 to 1974. The biggest declines were in areas that have experienced the most extreme temperature swings, suggesting that climate change is a significant factor. High temperatures can cause bumblebees to overheat and can also kill the flowers on which they depend. Adding to the problem is that bees aren’t migrating to cooler areas. “They’re simply not able to colonize new regions at the same rate that they’re disappearing from old ones,” lead author Peter Soroye, from the University of Ottawa, tells NPR.org. The authors stress that climate change isn’t the only cause of the bees’ decline; pesticide use and habitat loss also play a role. They say people can help the troubled insects by planting native flowers in their gardens and leaving out leaf piles and fallen logs to create shade for the bees on scorching days.
9-25-19 Crypt-keeper wasps can control the minds of 7 other species of wasp
A recently discovered parasitic wasp appears to have extraordinary mind-controlling abilities – it can alter the behaviour of at least seven other species. Many parasites manipulate the behaviour of their victims in extraordinary ways. For instance, sacculina barnacles invade crabs and make them care for barnacle larvae as if they were their own offspring. If the host crab is male, the parasite turns them female. It was thought each species of parasite could manipulate the behaviour of only one host, or at least only very closely related species. But the crypt-keeper wasp Euderus set is more versatile. It was known to parasitise Bassettia pallida, a species of gall wasp. Gall wasps lay their eggs in plants, triggering abnormal growths – galls – inside which the wasp larvae feed and grow. Adult gall wasps chew their way out of the gall and fly off. The crypt-keeper wasp seeks out oak galls and lays an egg inside them. The crypt-keeper larva then attacks the gall wasp larva. Infected gall wasps still start chewing their way out of the gall, but they stop when the hole is small and then remain where they are with their head blocking the exit, thus protecting the larva growing inside them – “keeping the crypt”. How the crypt-keeper larva makes the gall wasp stop chewing at such a precise point isn’t clear. “I’d love to know how they do it,” says Anna Ward at the University of Iowa. When the crypt-keeper larva turns into an adult wasp after a few days, it then chews through the head of the gall wasp to get out of the gall.The crypt-keeper wasp, which was only described in 2017, was thought to parasitise just one species of gall wasp. But when Ward’s team collected 23,000 galls from 10 kinds of oak trees as part of a larger study, they found that at least 7 of the 100 species of gall wasp they collected were parasitised by the same crypt-keeper wasp. “What we found is that it is attacking different hosts that don’t seem to be closely related,” says Ward.
9-18-19 Radio waves from electric devices may affect the body clock of insects
Weak radio frequency fields seem to affect the body clocks of cockroaches. If the finding is confirmed, it could mean that weak radio waves – which are already known to disorient birds – are capable of affecting a wide range of animals. However, Martin Vacha of Masaryk University in the Czech Republic, who conducted the study, says he is “very cautious” about his team’s results. In normal conditions, there might not be any effect on insects, he says, and the team isn’t making any claims about possible effects on people. Other scientists are sceptical, and say the study needs to be independently confirmed. Many claims have been made about possible effects of electromagnetic fields on humans and other animals. In particular, it is been claimed that the radio waves from mobile phones could cause cancer. But radio waves are much less energetic than, say, X-rays and don’t cause the damage to DNA that leads to cancer. Nonetheless, some researchers think they could have more subtle effects on living tissue. A couple of recent studies, for instance, have suggested that static magnetic fields affect the body clock of fruit flies. Vacha and his colleagues decided to look at whether they affect cockroaches too. His team kept cockroaches in constant dim UV light, with no clues as to whether it was night or day, and measured the animals’ activity using image analysis software. From that they worked out what time their body clocks were keeping. When they exposed the animals to either static magnetic fields or weak radio frequency broadband noise, the cockroaches’ periods of activity became an hour or two longer. In other words, their body clocks were running more slowly. Vacha says the team tested frequencies much lower than those from mobile phones. But many electric devices, such as computers, produce this kind of broadband noise.
9-15-19 Wasps: If you can't love them, at least admire them
Want to know the best way to kill a cockroach? Well, first inject some powerful neurotoxins directly into its brain. This will make the bug compliant; it won't try to fly away and will bend to your will. Second, slice off one of its antennae and drink the goo that comes out. For snack purposes, you understand. And then lead it off to your lair by the stump, like a dog on a leash. You're going to bury this zombie in a hole in the ground. But just before you close up the tomb, lay an egg on the bug. Your progeny can have the joy of eating it alive. Dr Gavin Broad relishes these stories about how wasps will parasitise other critters. He's the principal curator in charge of insect collections at London's Natural History Museum, which means he's got plenty of material to work with. He has drawer after drawer of wasps, gathered from all corners of the globe. Ok, I can already hear you saying, "I hate wasps even if they kill roaches". But spend just a few minutes with Gavin and I promise you your views will evolve. You'll marvel at their skill and in quite a few cases you'll be stunned (not stung) by their beauty. That destroyer of cockroaches, for example - Ampulex compressa - has an extraordinary iridescent exoskeleton. You can see why they sometimes call it the jewel wasp. "But every wasp is glorious," says Gavin, as he urges you to move beyond the PR spin that's got us to prefer beetles and bees instead ("Bees are just furry wasps that turned vegetarian"). Wasps have their role in Nature and it's not to pester humans in the autumn. Ignore those "yellow jackets" getting drunk on cider in September orchards; they'll soon be gone. No, wasps have very useful functions, one of which is to keep other insects in check. Every insect you can think of probably has some wasp that will attack it. If that wasn't the case, we'd almost certainly be using more pesticides than we already do on our farms.
8-30-19 More aggressive spiders
Parts of the U.S. where hurricanes occur most frequently may have another problem to worry about: the evolution of more-aggressive spiders. During last year’s hurricane season, researchers examined more than 200 colonies of Anelosimus studiosus spiders before and after three big storms in the Southeast. Anelosimus studiosus colonies are either relatively docile, with mothers working together to rear offspring, or much more combative, with a higher ratio of aggressive females. The researchers found that about 75 percent of the colonies survived the storm—and that the more-aggressive ones were much more likely to do so, probably because they outcompeted other spiders for the food and resources made scarce by the storm. The obvious evolutionary implication is that over time spiders will adapt to harsher weather events by becoming more aggressive—and that other species may also evolve in the same way. “As sea levels rise, the incidence of tropical storms will only increase,” lead author Jonathan Pruitt, from McMaster University in Canada, tells CNN.com. “We need to contend with what the ecological and evolutionary impacts of these storms will be for nonhuman animals.”
8-9-19 The Mosquito: A Human History of Our Deadliest Predator
Never underestimate that tiny insect whining in your ear, said Keith Johnson in Foreign Policy. “The mosquito, far and away mankind’s deadliest enemy, has killed half of all the people who have ever lived.” Per the calculations of historian Timothy C. Winegard, 52 billion people in all have died of malaria, yellow fever, and other mosquito-borne diseases, making the tiny pest the malevolent Zelig to our own species’ long journey through the ages. Winegard “finds no shortage of pivotal events to pin on the little critter.” The rise of Rome into an empire was aided by the invader-proof malarial swamps that surrounded the city. Mosquitoes also ended Alexander the Great’s campaigns. And they were major contributors to the British defeat at Yorktown. Though Winegard’s book is sometimes florid and sometimes repetitive, it “serves up an eye-opening, deeply alarming, and absolutely engrossing view of humanity’s most tenacious foe.” “There is very little of human history mosquitoes have not touched,” said Brian Bethune in Maclean’s. Though we’ve only known for a century that it is the mosquito, not “bad air,” that spreads malaria, humans have been in a fierce battle with the disease since the dawn of agriculture. About 8,000 years ago, when Bantu farmers in West Central Africa expanded their territory, the malaria parasite was waiting for them, and it proved so deadly that our bodies developed emergency genetic defenses, including sickle-cell anemia, a disorder that defends blood cells against the parasite but regularly results in death at about age 23. Five centuries ago, mosquito-borne diseases carried from the Old World to the New helped wipe out 95 percent of the Americas’ indigenous population. And because Africans had greater immunity to the illnesses than white indentured servants, millions of Africans were enslaved to serve as the New World’s labor class. Winegard sometimes gives the mosquito too much credit, said Brooke Jarvis in The New Yorker. His case for the mosquito’s role in the drafting of the Magna Carta, for example, relies on “a cascade of contingencies” stretching back centuries. But we who live in rich, temperate corners of the world are foolish if we presume that the mosquito has had its day in the human story. Climate change is expanding the reach of the genus and the diseases it carries. Though we think we are in control of our future, “the entire time that humanity has been in existence, the mosquito has been proof that we are not.”
7-5-19 Toxic processionary caterpillar plague spreads across Europe
Germany and the Netherlands are battling many infestations of oak processionary caterpillars, whose tiny toxic hairs can trigger allergic reactions and skin irritation. The mild winter and warm spring this year boosted caterpillar numbers. In Louvain, Belgium, firefighters had to destroy nests of the invasive species before a rock concert. The caterpillars turn into pupae, then moths in late July, and the threat diminishes. Germany's western Ruhr region is densely populated and among the worst affected by the caterpillars. Some schools and parks have been closed to allow specialists to attack the nests in oak trees. The caterpillars - measuring 2-3cm (about one inch) - march in long processions to the treetops at night, and can wreak havoc in oak trees, as they feast on the young leaves. One mature caterpillar has up to 700,000 hairs, which can be spread by the wind. The Fredenbaumpark in Dortmund was closed for three weeks, as nearly 500 trees were found to be infested there, broadcaster Deutschlandfunk reported. "The oak processionary infestation this year is very intensive - much more than last year," said the park's manager Frank Dartsch. Special teams there and elsewhere have donned protective gear and used firefighters' lifts to reach the treetops, where they have attacked the caterpillar nests with blowtorches or big vacuum cleaners. In the Netherlands, the infestations have also increased compared with 2018, with the oak-rich provinces of Noord-Brabant, Drenthe and Overijssel especially affected. A video of an elderly woman attacking the caterpillars with a heat gun in the city of Enschede has gone viral, the nltimes.nl website reports. Broadcaster RTL says the caterpillars have spread all over Luxembourg, a heavily forested country. The Luxembourg City authorities have issued a health warning, as the caterpillars are in the city too.
6-27-18 Bumblebees in cities are healthier than those in the countryside
Cities provide a refuge for bumblebees, which have been found to grow bigger colonies and store more food in urban areas than they do in the countryside. City bumblebees have been found to grow healthier colonies than those in the surrounding suburbs and countryside. They may be taking advantage of humans’ preference for flowering plants around businesses and homes. “There are a few species that are really able to exploit the urban environment – pigeons, rats, foxes. It seems like bees belong to that group,” says Ash Samuelson at the Royal Holloway University of London. She and her team raised colonies from wild-caught bumblebee queens, and placed them in 38 spots in areas with different degrees of urbanisation – inner-city London, surrounding suburbs, and rural farmland in southeast England. They tracked the size of the eventual colony, and the amount of pollen and nectar the bees stored. Both the village and city colonies produced a significantly higher number of offspring than the countryside bees. Samuelson says this suggests that queen bees in the cities and villages lived longer and were able to build up a larger troupe of worker bees. “Cities can be very good resources for bees. There are gardens and parks that have a lot of flowers available all year round,” she says. “In agricultural areas, you have mass crops that provide flowers only for a short-lived period.” The bees that lived among the crops stored less food – an indicator of colony strength – than their city counterparts.
5-3-18 Flying beetle cyborgs guided with tiny battery-powered backpacks
Beetles have been turned into autonomous flying robots. They could one day swarm through disaster zones on search and rescue missions. Buzzing cyborg beetles are taking to the skies. Just when you thought big insects were creepy enough, electronic filled bug backpacks have been used to turn them into controllable flying bio-robots. Male M. torquata beetles had electrodes implanted into four of their flight muscles. Small electric pulses were then administered to steer them left or right. Their acceleration could be increased by upping the frequency of the pulses. A 3D motion capture system tracked their position during flight. The researchers found that when a continuous pulse was applied, the beetles would eventually adapt to the intervention. However, applying two short pulses lasting 150 milliseconds, with a 50 millisecond rest in between, was most effective for controlling their route, reaching a success rate of 79 percent when the beetle’s position was reassessed every 200 ms. “This is the first demonstration that insect motion can be steered in a desired direction in a consistent way,” says Sawyer Fuller from the University of Washington in Seattle, who is not involved with the research. “It shows that truly autonomous, bio-hybrid robots the size of insects are a real technical possibility.” The beetle cyborgs were created by Hirotaka Sato from Nanyang Technological Institute in Singapore, Malaysia and his colleagues. They were interested in building tiny flying robots and by using beetles as the starting point, Sato and his team could avoid the incredibly difficult task of making small robotic bodies.
2-6-18 Pollinators are usually safe from a Venus flytrap
Out of the hundreds of species of carnivorous plants found across the planet, none attract quite as much fascination as the Venus flytrap. The plants are native to just a small section of North Carolina and South Carolina, but these tiny plants can now be found around the world. They’re a favorite among gardeners, who grow them in homes and greenhouses. Scientists, too, have long been intrigued by the plants and have extensively studied the famous trap. But far less is known about the flower that blooms on a stalk 15 to 35 centimeters above — including what pollinates that flower. “The rest of the plant is so incredibly cool that most folks don’t get past looking at the active trap leaves,” says Clyde Sorenson, an entomologist at North Carolina State University in Raleigh. Plus, notes Sorenson’s NCSU colleague Elsa Youngsteadt, an insect ecologist, because flytraps are native to just a small part of North and South Carolina, field studies can be difficult. And most people who raise flytraps cut off the flowers so the plant can put more energy into making traps.
11-4-17 This robot was inspired by bees. And it can swim.
"What's better than a robot inspired by bees? A robot inspired by bees that can swim." "What's better than a robot inspired by bees? A robot inspired by bees that can swim," said Katherine Ellen Foley at Quartz. Researchers guided by a team of scientists from Harvard University have developed a tiny, bee-size bot, weighing the same as "about two feathers," to study the ocean. The robot has "insect-inspired wings that can both flap and rotate," allowing it to dive into water, swim, take off again, and land safely. It also comes equipped with its own "little chemical lab" to help it break the water's surface tension after it has taken a plunge. The bot converts water into oxygen and hydrogen, and once enough gas is generated, "a lighter sets it on fire, the force of which shoots the robot about 12 inches into the air." Scientists hope the robots will be able to "keep tabs on fish and algae populations," monitor water pollution, and even participate in search-and-rescue missions at sea.
8-3-17 Pollination threatened by artificial light
Pollination threatened by artificial light
Researchers have discovered a new global threat to pollination - artificial light at night, which was found to reduce visits of nocturnal pollinators to flowers by 62%. The impact of this is a significant reduction in fruit production. Pollinator numbers are declining worldwide so this is not good news for wild plants and crop production. Nocturnal insects are easily distracted from their pollination duties by the lure of bright lights. Fruit begins with a flower, but not every flower results in a fruit. A number of factors result in the remarkable transformation of flower to fruit and one of the most important is insect pollination. But insects are in rapid decline caused largely by an anthropogenic assault including habitat loss and disruption, pesticide use, invasive alien species and climate change. But in a new study reported in Nature, another threat is revealed - artificial light at night. Dr Eva Knop, University of Bern, Switzerland, who led the research said: "Our study suggests that it is quite common for plants to have both night and day pollinators. During night it is often the scent that attracts the nocturnal pollinators but also other cues can be important, such as visual cues as the nocturnal pollinators have often very sensitive eyes." We are all familiar with bees and butterflies pollinating flowers during the day but come sundown a parade of "night-shift" pollinators take over. "In our study, the most abundant night time pollinators were moths (Lepidoptera), followed by beetles (Coleoptera) and bugs (Hemiptera)", said Dr Eva Knop. But, owing to artificial light contamination, from street lamps for example, our nights are no longer properly dark. Artificial light at night is spreading globally at an estimated rate of 6% per year.
8-2-17 Light pollution can foil plant-insect hookups, and not just at night
Light pollution can foil plant-insect hookups, and not just at night
For cabbage thistles, daytime pollinators didn’t make up for missed after-hours seed-making. Artificial light at night upsets pollinating insects and plants, and that disruption may spread into daylight hours. For flowers, too much light at night could lead to a pollination hangover by day. Far from any urban street, researchers erected street lights in remote Swiss meadows to mimic the effects of artificial light pollution. In fields lit during the night, flowers had 62 percent fewer nocturnal visitors than flowers in dark meadows, researchers report August 2 in Nature. For one of the most common flowers, daytime pollination didn’t make up for nightly losses, says ecologist Eva Knop of the University of Bern in Switzerland. In a detailed accounting of the pollination life of cabbage thistles (Cirsium oleraceum), Knop and colleagues found that night-lit plants produced 13 percent fewer seeds overall than counterparts in naturally dark places.
The World of Insects Movies
Endorsed by Sioux Falls Zoologists