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14 of the greatest animal migrations

By: Bryan Nelson on Sept. 27, 2010, 9 a.m.
A pinniped lounges on some rocks.

Photo: Kiwi Mikex/Flickr

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Pinnipeds such a seals, sea lions and walruses also are known for making incredible sea journeys.

Fur seals are known to swim the equivalent of a fourth of the way around the world every year. Elephant seals have been recorded making a 20,000-kilometer migration every year, and they also dive deeper than any other seal. Walruses have a migratory route through icy Arctic waters, a journey that has been a mystery to scientists until recently.