Zoological name: There are two living species: the common,
river or Nile hippopotamus (Hippopotamus amphibious) and
the pigmy hippopotamus (Choeropsis liberiensis). They are
distantly related to pigs.
Distribution: These animals are distributed in Africa.
Habitat: The ideal habitats of common hippos are short grasslands, lakes and rivers. The pigmy hippos may remain in lowland forests, swamps etc.
Physical feature: The barrel-shaped body of a common hippo may reach up to a length of about 12 ft. and an individual may reach up to a body weight of 4000 kg (usually 1600-3200 kg). The other salient features are smooth skin, short and stumpy legs, four toes on each leg, presence of incisor and canine teeth, flat tail, devoid of sweat glands, and no gall bladder. The penis is directed backward.