Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Yellow-tailed Woolly Monkey, Oreonax flavicauda, is a New World monkey endemic to Peru. It is a rare primate species found only in the Peruvian Andes. It has formerly been estimated that fewer than 250 individuals are left in the wild, but there are no current estimates of its population size. It is currently classified in the monotypic genus Oreonax within the Atelidae family, but in the past has been classified as a member of the genus Lagothrix with the rest of the woolly monkeys. The hair of the Yellow-tailed Woolly Monkey is long and thick, an adaptation to its cold montane forest habitat. Its color is deep mahogany, with yellow on the underside of the rear surface of the tail and a whitish patch on the muzzle. The average weight is 5.7 kg (12.5 lb) for females and 8.3 kg (18.3 lb) for males. The Yellow-tailed Woolly Monkey lives in the montane cloud forests of the Peruvian Andes at elevations of 1700 - 2500 m (5600'' - 8200''), where there are steep gorges and ravines. Its diet is primarily frugivorous, but leaves, flowers, and buds are also eaten.