Someone sent a wind-up robot tottering into a nest of Australian bull ants, a species "characterised by their extreme aggressiveness, ferocity, and painful stings." It's a delight to watch these formicidaen bullies spend themselves impotently on the unfeeling skin of a toy, thus proving the superiority of humans over jerky ants. (via Beyond the Beyond)
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Colonies of ants base decisions like where to establish a nest based on their population density. Scientists theorize that ants can estimate how many of their kind are around by randomly exploring the area and bumping into other ants. New research from MIT computer scientists not only supports this theory but could also be used to analyze social networks, improve robot swarms, and yield improve algorithms for networked communications in distributed computing applications. From MIT News:
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“It’s intuitive that if a bunch of people are randomly walking around an area, the number of times they bump into each other will be a surrogate of the population density,” says Cameron Musco, an MIT graduate student in electrical engineering and computer science and a co-author on the new paper. “What we’re doing is giving a rigorous analysis behind that intuition, and also saying that the estimate is a very good estimate, rather than some coarse estimate. As a function of time, it gets more and more accurate, and it goes nearly as fast as you would expect you could ever do.”
Musco and his coauthors — his advisor, NEC Professor of Software Science and Engineering Nancy Lynch, and Hsin-Hao Su, a postdoc in Lynch’s group — characterize an ant’s environment as a grid, with some number of other ants scattered randomly across it. The ant of interest — call it the explorer — starts at some cell of the grid and, with equal probability, moves to one of the adjacent cells. Then, with equal probability, it moves to one of the cells adjacent to that one, and so on.
In this video a butterfly is trying to eat something but a turfy ant won't let it. Read the rest
Here are side-by-side video clips comparing a bunch of fire ants with different kinds of liquid.
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Fire ants use their claws to grip diverse surfaces, including each other. As a result of their mutual adhesion and large numbers, ant colonies flow like inanimate fluids. This film shows how ants behave similarly to the spreading of drops, the capillary rise of menisci, and gravity-driven flow down a wall. By emulating the flow of fluids, ant colonies can remain united under stressful conditions.
These ants circle an iPhone like it's the Ka'aba in Mecca. Read the rest
Leafcutter ants are fascinating tropical creatures that farm fungus gardens, require access to certain resources in order to survive and grow, and are constantly splitting off from the pack to form new colonies with connections to the old. Which, of course, makes them the perfect species to adapt into a version of Settlers of Catan
, as entomologist M.L. Henneman has done. Read the rest
As they move through tunnels dug in a wide variety of soils, ants do sometimes slip and fall down their own shafts. But they catch themselves, with their limbs and even with their antenna. Scientists are studying the ways ants brace against a fall to help design better robotos for search-and-rescue missions
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University of Lausanne biologists chipped hundreds of ants and digitally tracked them to see how they form social groups and work collectively to get stuff done. Based on the data, they created heat maps and visualized the ants' trajectories. From Nature:
The biologists… have found that the workers fall into three social groups that perform different roles: nursing the queen and young; cleaning the colony; and foraging for food. The different groups move around different parts of the nest, and the insects tend to graduate from one group to another as they age, the researchers write in a paper published today in Science.
“The paper is a game-changer, in the size and detail of the data set that was collected,” says Anna Dornhaus, an entomologist at the University of Arizona in Tucson.
"Tracking whole colonies shows ants make career moves
" (Thanks, Nic Weidinger
Below is a video, accelerated five times.
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There's a war on in America, pitting invasive ant against invasive ant in a fight to the finish. It's sort of like Alien vs. Predator, in a way, because whoever wins ... we lose. Argentine ants (the reigning champions) have wiped out native ant species in many of the environments they've invaded over the years, affecting the survival of other animals that used to feed on those ants. Worse, they have a fondness for certain agricultural pests, like aphids. In places with lots of Argentine ants, aphids do very well — and plants do worse.
But now the Argentines are facing a serious challenge in the form of Asian needle ants, another invasive species that — for reasons nobody really understands — have suddenly gone from minor player to major threat in the last decade. The big downside to Asian needle ants: They sting. They sting us. And, right now, it looks like they're winning.
John Roach tells the story at NBC News. But you can get a good idea of what this matchup looks like by checking out the work of insect photographer Alex Wild. That's his picture above, showing an Argentine ant on the left and an Asian needle ant on the right. Read the rest
Messing with ants for fun (and scientific profit)
François Vautier infested his flatbed scanner with an ant-colony and scanned the burgeoning hive-organism every week for five years, producing a beautiful, stylized stop-motion record of the ants' slow consumption of his electronics.
Five years ago, I installed an ant colony inside my old scanner that allowed me to scan in high definition this ever evolving microcosm (animal, vegetable and mineral). The resulting clip is a close-up examination of how these tiny beings live in this unique ant farm. I observed how decay and corrosion slowly but surely invaded the internal organs of the scanner. Nature gradually takes hold of this completely synthetic environment.
ANTS in my scanner a five years time-lapse!
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This is simply breathtaking.
In the video, researchers pump 10 tons of concrete down an ant hole and then slowly, carefully excavate the site to see what an ant colony looks like. The result is an intricate structure, equivalent in labor to humans building the Great Wall of China.
And then you think, "Oh, and we just pumped 10 tons of concrete down it. Oh. We're ... kind of assholes sometimes, aren't we?" Sorry ants. Sants.
Via Richard Martyniak Read the rest