CLOSE
YouTube // Deep Look
YouTube // Deep Look

The Fly That Acts Like a Hermit Crab

YouTube // Deep Look
YouTube // Deep Look

You may know the caddisfly as one of the flies that fly fishers emulate when creating lures. (Trout love them.) But when this fly is in its larval stage, it does something special: Caddisfly larvae build armor out of pebbles and sand.

Much like hermit crabs, the caddisfly larvae repurpose existing items to make a safe home. In order to create their "armor," the larvae use sticky silk to stitch the pieces together. This silk is remarkable, because it only sticks to the rocks, and it remains flexible underwater. This comes in handy because the larvae tend to live in very high-current areas, which can fling them around. When the larvae are ready to transform into adults, they attach their armored shell to an underwater surface and pupate inside.

The properties of caddisfly silk may be useful in medical research; we're still trying to make something like it. In this Ultra HD (4K) video, Deep Look takes us into the tiny, sticky world of the caddisfly. Enjoy:

Incidentally, it's tough making a video about tiny underwater larvae living in extreme currents. Here's a making-of video from Deep Look, explaining just how they did it!

For more (or if you're not into watching videos), check out this KQED Science story about the caddisfly.

nextArticle.image_alt|e
iStock
arrow
Live Smarter
Which Rooms In Your Home Have the Most Types of Bugs, According to Entomologists 
iStock
iStock

Insects can make any home their own, so long as it contains cracks, doors, and windows for them to fly, wriggle, or hitchhike their way in. And it turns out that the creepy crawlers prefer your living room over your kitchen, according to a new study that was recently highlighted by The Verge.

Published in the journal Scientific Reports, the study looked at 50 homes in Raleigh, North Carolina, to measure their insect populations. Entomologists from both North Carolina State University and the California Academy of Sciences ultimately discovered more than 10,000 bugs, both alive and dead, and a diverse array of species to boot.

The most commonly observed bugs were harmless, and included ladybugs, silverfish, fruit flies, and book lice. (Luckily for homeowners, pests like bedbugs, termites, and fleas were scarcer.) Not all rooms, though, contained the same distribution of many-legged residents.

Ground-floor living rooms with carpets and windows tended to have the most diverse bug populations, as the critters had easy access inside, lots of space to live in, and a fibrous floor habitat that could be either a cozy homestead or a death trap for bugs, depending on whether they got stuck in it. The higher the floor level, the less diverse the bug population was, a fact that could be attributed to the lack of doors and outside openings.

Types of bugs that were thought to be specific to some types of rooms were actually common across the board. Ants and cockroaches didn’t limit themselves to the kitchen, while cellar spiders were present in all types of rooms. As for moths and drain flies, they were found in both common rooms and bathrooms.

Researchers also found that “resident behavior such as house tidiness, pesticide usage, and pet ownership showed no significant influence on arthropod community composition.”

The study isn’t representative of all households, since entomologists studied only 50 homes within the same geographical area. But one main takeaway could be that cohabiting bugs “are an inevitable part of life on Earth and more reflective of the conditions outside homes than the decisions made inside,” the researchers concluded. In short, it might finally be time to make peace with your itty-bitty housemates.

[h/t The Verge]

nextArticle.image_alt|e
iStock
arrow
environment
UK Agrees to Ban Pesticides That Destroy Bee Populations
iStock
iStock

As bee populations around the globe continue to dwindle, more countries are stepping up to save them. The latest nation taking action against the threat of pollinator decline is Britain. The UK’s environment secretary Michael Gove recently announced that the country will join the European Union in restricting a type of pesticide harming bees.

The decision was made in light of a German study reporting that the number of flying insects in some areas have declined by 75 percent in just a quarter of a decade. Of the species dying off en masse, bees are the most concerning: The insects pollinate a significant portion of our crops, and without them humans could face an agricultural crisis. “These particular flying insects are absolutely critical to the health of the natural world,” Gove wrote for The Guardian. “Without a healthy pollinator population we put the whole ecological balance of our world in danger.”

The alarming state of bee populations is likely a mix of several factors, but human-made insecticides are one of the biggest contributors. Neonicotinoids, the chemical compounds covered by the proposed ban, are the most commonly used insecticides on Earth, and they’ve also been shown to have devastating effects on bee colonies. Getting rid of them completely was first proposed by the European Union in 2013, and after initially opposing the move, the UK is finally getting on board.

Neonicotinoids are slowly being phased out in the U.S., where beekeepers have been reporting bees disappearing from their hives for the last decade or so. If you want to make your backyard a more hospitable place for your tiny, flower-loving neighbors, here are some ways you can help right now.

[h/t The Guardian]

SECTIONS

arrow
LIVE SMARTER
More from mental floss studios