Pygmy hippopotamus occur. The common hippopotamus gives birth and mates only in the water, but pygmy hippos mate and give birth on both land and water. Young pygmy hippos can swim almost immediately. At birth, pygmy hippos weigh 4.5–6.2 kg (9.9–13.7 lb) with males weighing about 0.25 kg (0.55 lb) more than females. Pygmy hippos are fully weaned between six and eight months of age; before weaning they do not accompany their mother when she leaves the water to forage, but instead hide in the water by themselves. The mother returns to the hiding spot about three times a day and calls
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