The traps are woven together using hairs stripped from the ants’ host plant and reinforced with fungus, producing a platform with pitted holes. “The ants are always hiding just under the holes, waiting with their mandibles open. When an insect arrives they immediately grab the legs and antennae,” says Orivel. This pulling immobilises the victim, stretching it out as though being tortured on a mediaeval rack.
Worker ants then clamber over their helpless prey, biting and stinging until the victim is paralysed or dead. The carcass is then chopped into small pieces while still on the rack or, more likely, carried back to the leaf pouch where the ants nest to be devoured. The surprise-attack traps are “like something out of Edgar Allan Poe”, says Mike Kaspari, an ant expert at the University of Oklahoma, US.
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