These spiders use vibrations in their mega-web to choreograph a synchronized swarming process.
Pack hunting spiders exist in places other than your nightmares. While most spiders enjoy solitary lives, 20 of the roughly 50,000 known spider species live in colonies. One species, Anelosimus eximius, lives in extremely large colonies of up to 1,000 individual spiders that work together to build webs spanning several meters.
“What is fantastic is that there is no leadership role among these spiders,” said Raphael Jeanson, a researcher at the Research Center on Animal Cognition at the University of Toulouse in France and senior author on a new study about the social arachnids. Rather, the entire spider colony coordinates its attack with each individual receiving the same information.
Using both field observations and computer simulations of this coordinated attack, Jeanson’s team learned that the attack is directed almost entirely by vibrations in the shared web. By luring the spiders with a dead fly glued to the end of a vibration generator, the researchers showed that hunting behavior was, in fact, triggered by the struggling of helpless prey. However, that didn’t explain the colony’s coordinated movements.
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