Spiders hunt in packs of hundreds to swarm prey

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. When prey falls into their web, these social spiders coordinate and attack their victim together, which allows them to take down much larger prey than they could if they hunted alone. Until now, exactly how these spiders carry out such coordinated attacks was a mystery.

It turns out, the spiders use vibrations in their mega-web to choreograph a synchronized swarming process, the study found.

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