Africa's Great Migration of Wildebeest Shows "Swarm Intelligence"

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wildebeest deep water photo
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"Eventually," they add, "it takes one brave individual to venture into the water and then all the other animals rush to follow. We often spent many frustrating hours waiting for a dithering herd to start crossing!"

SLIDESHOW: 10 Swarms to Make You Squirm

Photo credit: Burrard-Lucas