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14 of the greatest animal migrations

By: Bryan Nelson on Sept. 27, 2010, 9 a.m.
A swarm of bats in the evening air

Photo: KajiFox/Flickr

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Although only a few bat species are migratory, the ones that travel seasonally do so in spectacular fashion.

In fact, the world's largest mammal migration is the annual journey of Zambia's straw-colored fruit bats. An astounding 8 million bats blanket the air during the migration, as they travel to feed on their favorite delicacy, the musuku fruit.