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They are both quadruped mammals- and the name hippopotamus means "River Horse".

Answer:

They aren't related.

Despite their Greek derived name hippos are more closely related tp cetaceans (whales, porpoises, etc.) from which they diverged about 55 million years ago. The common ancestor of whales and hippos evolved from the family of even-toed ungulates(pigs, peccaries, camels, deer, giraffes, pronghorn, antelopes, sheep, goats, and cattle.) around 60 million years ago.

Horses, on the other hand, are odd-toed ungulates. Together with horses this group includes tapirs and rhinoceroses.

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14y ago

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