Hippopotamus Surprise egg" of the Italian chocolate company Ferrero SpA. Hippopotamus 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" (). 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
Pygmy corydoras pygmy, in its scientific name, "Corydoras pygmaeus". The common names for the species are "pygmy catfish" and "pygmy corydoras". A species of Corydoras with a similar appearance, "Corydoras hastatus" was described in the 1880s, and many specimens that were described as "Corydoras hastatus" between the 1920s and 1950s were subsequently found to be misidentified specimens of the pygmy corydoras. In older literature, the pygmy corydoras is frequently mislabeled because "Corydoras hastatus" was the only miniature Corydoras species known at the time. The pygmy corydoras is a silver-colored fish, with an unbroken black line that runs horizontally along the center of