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14 of the greatest animal migrations

By: Bryan Nelson on Sept. 27, 2010, 9 a.m.
Caribou wade through water

Photo: ZUMA Press

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North America's caribou populations migrate the furthest of any terrestrial mammal, a journey that can span more than 3,000 miles annually.

Herds of the migrating animals can grow to impressive numbers — as many as half a million individuals — rivaled only by Africa's great wildebeest migrations. During the winter, caribou travel to forested areas for easier foraging, and they migrate in the summer to superior calving grounds.