Pygmy hippopotamus the pygmy hippopotamus, are considered dwarf hippopotamuses, rather than pygmies. They are likely descended from a full-sized species of European hippopotamus, and reached their small size through the evolutionary process of insular dwarfism which is common on islands; the ancestors of pygmy hippopotami were also small and thus there was never a dwarfing process. There were also several species of pygmy hippo on the island of Madagascar (see Malagasy hippopotamus). Pygmy hippos share the same general form as a hippopotamus. They have a graviportal skeleton, with four stubby legs and four toes on each foot, supporting a portly frame. The
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