Pygmy hippopotamus population that freely breeds in zoos around the world. Between 1970 and 1991 the population of pygmy hippos born in captivity more than doubled. The survival of the species in zoos is more certain than the survival of the species in the wild. In captivity, the pygmy hippo lives from 42 to 55 years, longer than in the wild. Since 1919, only 41 percent of pygmy hippos born in zoos have been male. While the common hippopotamus was known to Europeans since classical antiquity, the pygmy hippopotamus was unknown outside its range in West Africa until the 19th century. Due
Pygmy slow loris the Association of Zoos and Aquariums established a Species Survival Plan for the species, following a proposal by the Global Captive Action Plan for Primates to create a breeding program to maintain its genetic diversity. As of 2008, the captive population in North America had grown to 74 individuals, with most of them born at the San Diego Zoo; as of 2013, the species is the most common lorisid primate kept in North American zoos. About 175 pygmy lorises live in breeding facilities worldwide. Pygmy slow loris The pygmy slow loris ("Nycticebus pygmaeus") is a species of slow loris found