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White-headed langur
The white-headed langur (''Trachypithecus poliocephalus'') is a critically endangered langur. Two subspecies are recognized: ''T. p. poliocephalus'' in Cát Bà Island, Vietnam, and ''T. p. leucocephalus'' in Guangxi, China. The former (the nominate subspecies), often known as the golden-headed or Cat Ba langur, is among the rarest primates in the world, and possibly the rarest primate in Asia, with population size estimated at less than 70 individuals.〔Stenke, R., Phan Duy Thuc and Nadler, T. 2007. (Golden-headed Langur or Cat Ba Langur. ) In: Primates in Peril: The World’s 25 Most Endangered Primates 2006–2008, R. A. Mittermeier et al. (compilers), pp.14-15. Unpublished report, IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS), and Conservation International (CI), Arlington, VA.〕
== Description ==
Both subspecies are overall blackish, but the crown, cheeks and neck are yellowish in ''T. p. poliocephalus'', while they are white in ''T. p. leucocephalus'', as suggested by its scientific name.〔(White-headed langur (Trachypithecus poliocephalus). ) ARKive. Accessed 2008-07-15〕 According to the Cat Ba Langur Conservation Project, the The Cat Ba langur's skin is black and the pelage color is dark brown; head and shoulder are bright golden to yellowish-white. The tail is very long (ca. 85 cm) compared with the body size (ca. 50 cm). Babies are colored golden-orange; the pelage starts to change its color from about the fourth month on. Males and females look alike.
The Cat Ba Langur, which lives on Cat Ba Island in Vietnam, is one of the 25 most endangered species. Conservation efforts are helping to prevent this, however, and have greatly increased their population since 2003, when there were only 40. Until recently, the Cat Ba Langur was not considered a species but rather a subspecies of other Langurs that live in the Vietnam jungles. Cat Ba Langurs are diurnal creatures and travel in groups of about four to five animals. They prefer the steep limestone cliffs that make up most of Cat Ba Island. Most of the places that they are found are not accessible to humans by foot. Cat Ba Langurs spend around 66% of their time resting and the rest moving, foraging, and socializing, with the distribution changing between summer and winter. They eat less and rest more in the winter and the opposite in the summer.
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