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14 of the greatest animal migrations

A school of tuna swim through the ocean.

Photo: ZUMA Press

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Tuna

Tuna are among the ocean's fastest swimming migratory fish. At least one tuna has been recorded making a 25,000-mile journey (three Pacific Ocean crossings over the period of just 20 months) between the U.S. and Japan.

The amazing migration was recorded by the 10-year Census of Marine Life, an undertaking that includes experts from 73 countries.