Until 1909, naturalists grouped hippos with pigs, based on molar patterns. But modern science has since established that, first from blood proteins, molecular systematics, and fossil record, their closest living relatives are cetaceans (whales, dolphins, and porpoises).
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Meet the Hippo, the world’s third largest mammal
NewVision Reporter
@NewVision
Each year, World Hippopotamus Day is celebrated on February 15th to learn more about the world’s third-largest mammal.
Until 1909, naturalists grouped hippos with pigs, based on molar patterns. But modern
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