Lincoln Park Zoo cooperatively manages pygmy hippopotamus populations with other institutions in the Association of Zoos and Aquariums. Both types of hippos are threatened by habitat loss due to logging and human settlement. Due to habitat loss, the pygmy hippo is endangered. Pygmy Hippopotamus Pygmy Hippopotamus Classification and Evolution. The park's 509 square miles are the most effectively protected pygmy hippopotamus habitat according to the IUCN. In anthropology, pygmy peoples are ethnic groups whose average height is unusually short. The term pygmyism is used to describe the phenotype of endemic short stature (as opposed to disproportionate dwarfism occurring in isolated cases in a population) for populations in which adult men are on average less than 150 cm (4 ft 11 in) tall.. Because the species is nocturnal and solitary, exact population numbers are unknown, but scientists estimate that 3,000 of the animals may live in the wild. Pygmy hippos are particularly sensitive to habitat loss. The IUCN has listed the pygmy hippopotamus as an endangered species. Weighing up to 8,000 pounds, the hippo is the heaviest land animal after the elephant. Weight: up to 300 kg. Population in the Wild: 3,000 The pygmy hippopotamus (or Hexaprotodon liberiensis) is a species of medium-sized mammal that lives in the rainforests and swamps of Sierra Leone, Liberia, Guinea and the Ivory Coast. Lifestyle: Lives alone in swamps, streams and dense forest. San Diego Zoo Celebrates Its First Endangered Pygmy Hippo Birth in 30 Years The 4-year-old first-time mom Mabel welcomed a male calf on April 9, and the baby has since been "surpassing" milestones Very little is known about the shy pygmy hippo, and while common hippos are listed as vulnerable and pygmy hippos endangered, both of their conservation statuses are based on a 2004 estimate recommendation. According to the Pygmy Hippo Foundation resource, the total population of this species in the wild is about 2,000 individuals, majority of which live in Liberia and the rest inhabit Sierra Leone, Guinea and the Ivory Coast. The hippopotamus, also known as the “river horse,” lives along the rivers and lakes throughout sub-Saharan Africa. Pygmy hippo populations also live in Tai National Park in the Ivory Coast and the Gola Forest Reserve in Sierra Leone. Pygmy hippos are nocturnal and reclusive by nature so, coupled with the vastly declined numbers over the last few decades, little is known about their behaviours in the wild. The overall remaining population of pygmy hippos is estimated at 3,000 individuals.