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
Saint Bathans mammal bat and several currently unclassified species, also existed. Saint Bathans mammal The Saint Bathans mammal is a currently unnamed extinct mammal from the Miocene of New Zealand. A member of the Saint Bathans Fauna, it is notable for being a late surviving "archaic" mammal species, neither a placental or marsupial, as well as for providing evidence that terrestrial mammals did in fact once live in Zealandia, in contrast with modern New Zealand, where bats are the only mammals in otherwise bird-dominated terrestrial faunas. The Saint Bathans mammal is currently represented by two specimens, MNZ S.40958 and MNZ S.42214, composed of