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
Longnose pygmy shark suggesting that it was close to the birth size. Males and females attain sexual maturity at under long respectively. Only six specimens of the longnose pygmy shark are known to science. Its small size and oceanic habits appear to preclude its capture by most fisheries. Coupled with its wide distribution, this species does not seem threatened by human activity and has been listed under Least Concern by the International Union for Conservation of Nature (IUCN). Longnose pygmy shark The longnose pygmy shark ("Heteroscymnoides marleyi") is a rare species of dogfish shark in the family Dalatiidae and the only member its