that comprises their diets. The number of incisors varies even within the same species, but the general dental formula is given in the table below:

Evolution

The hippopotamids are descended from the anthracotheres, a family of semiaquatic and terrestrial artiodactyls that appeared in the late Eocene, and are thought to have resembled small- or narrow-headed hippos. The hippos split off from the anthracotheres some time

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