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 hog small reptiles. The species was first described as the only member of the genus "Porcula", by Brian Houghton Hodgson but was later moved with other pig species in the genus "Sus" and named "Sus salvanius". A 2007 genetic analysis of the variation in a large section of mitochondrial DNA suggested that the original classification of the pygmy hog as a distinct genus was justified. The resurrection of the original genus status and the species name "Porcula salvania" has been adopted by GenBank. The species name "salvania" is after the sal forests where it was found. The pygmy hog is the