Who's your daddy? Hippo ancestry unveiled

February 25, 2015 9:03 AM

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A great-great grandfather of the hippopotamus likely swam from Asia to Africa some 35 million years ago, long before the arrival of the lion, rhino, zebra and giraffe, researchers said Tuesday.

Analysis of a previously unknown, long-extinct relative also confirmed that cetaceans -- the group to which whales, dolphins and porpoises belong -- are in fact the hippo's closest living cousins.

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