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The common hippopotamus (Hippopotamus amphibius), or hippo, is a large, mostly herbivorous, semiaquatic mammal native to sub-Saharan Africa, and one of only two extant species in the family Hippopotamidae, the other being the pygmy hippopotamus (Choeropsis liberiensis or Hexaprotodon liberiensis). The name comes from the ancient Greek for "river horse" (ἱπποπόταμος). After the elephant and rhinoceros, the common hippopotamus is the third-largest type of land mammal and the heaviest extant artiodactyl. Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the Hippopotamidae are cetaceans (whales, dolphins, porpoises, etc.) from which they diverged about .

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Hippo milk is pink

Contributed by Allie Johnson

The birth of a baby hippo named Obi (meaning heart in Nigerian Igbo language) in late May/early June at Melbourne Zoo in Victoria Australia was the first male calf born there since 1981. This video shows him splashing around in his first swim in the big pool. The pygmy hippo is an endangered species facing habitat loss and illegal poaching. Obi is expected to grow to only a quarter of the height and weight of a full-sized hippo.

Contributed by Sam Feldstone

This is my hippo collection.

I collect hippos! Stuffed, plastic, etc. I even have a real one in my backyard! (just kidding) Anyway, I don't know many fellow hippo collectors... what do you collect?

Contributed by James Sharpe

Cute picture, I think.

Contributed by Kristen Sauer

Hippo meet Human

Although hippos might look a little chubby, they can easily outrun a human.... But... Can they win a staring contest against a human????

Contributed by Vanessa Lam

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