Ability to capture large prey may be origin of army ants' cooperative behavior

Scientific insights come at the darnedest times. Animal behaviorist Sean O'Donnell was having an afternoon cup of coffee when a giant earthworm exploded out of the leaf litter covering the jungle floor in an Ecuadorean nature preserve. The worm, later measured at nearly 16 inches long, was pursued by a column of hundreds of raiding army ants that quickly paralyzed or killed it.

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<p><a href="http://www.physorg.com/news9123.html">Ability to capture large prey may be origin of army ants' cooperative behavior</a></p> <p>Scientific insights come at the darnedest times. Animal behaviorist Sean O'Donnell was having an afternoon cup of coffee when a giant earthworm exploded out of the leaf litter covering the jungle floor in an Ecuadorean nature preserve. The worm, later measured at nearly 16 inches long, was pursued by a column of hundreds of raiding army ants that quickly paralyzed or killed it.</p>