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Nature 413, 265 (20 September 2001) | doi:10.1038/35095151

Ecology: Crowd trouble for predators

Peter D. Moore

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Flocking, herding, swarming: call it what you will. But when you're somebody's lunch there's safety in numbers, even when the predator is an aquatic plant.

Avoiding being eaten is (obviously) one way that most organisms escape premature death. There are many techniques for evading predation, one of the most frequent being the herding or flocking behaviour often seen in certain mammals, birds and fish.