Gray-shanked douc

P. cinerea was originally described as a subspecies of P. nemaeus in 1997, but later elevated to species status due to morphological differences. Other research has shown significant genetic differences as well. This species does sometimes hybridize with P. nemaeus. ==Physical description==

Grey-shanked doucs are very similar in appearance to P. nemaeus. They are light grey with a pale underside. Their feet and hand are black and their shins are dark grey. The face is brownish orange on top with a white chin. The throat is white and lined on the bottom with an orange-brown collar. Males are slightly larger than females, averaging . Females average about . ==Behavior==

Grey-shanked doucs are diurnal and primarily arboreal. They move about through trees by jumping and brachiating. In the past they have been found in groups as large as fifty individuals but those numbers have been greatly reduced to 4 to 15 individuals. Males are the dominant gender and dominance hierarchies have been observed while in captivity. Grey-shanked doucs also engage in grooming to remove parasites and to establish and strengthen bonds between group members. This is usually done before resting for the night. Group members will also spar with each other. Sparring is a type of aggressive behavior in which participants will slap, pull, and grab each other. Reproduction The breeding season usually occurs between August and December and gestation is about 165 to 190 days. When courting, potential mates will use facial expressions to indicate that they are ready to copulate. One will thrust its jaw forward, shake its head, and raise and lower its eyebrows. The other will then respond with the same action. This may be repeated several times. The female then presents herself to the male. Births usually occur between January and August, during the fruiting season. The mother will give birth to one offspring weighing . Females are sexually mature at about four years of age. ==Conservation==

The grey-shanked douc langur is listed on the IUCN Red List as critically endangered. Researchers have concluded that due to the major deforestation and climate change of these provinces of Vietnam, that the population of the Grey-shanked duoc will sharply decline in the next coming years (Vu et al., 2020). Their species will be pushed into a high mountainous area with little to no resources for survival (Tran et al., 2018) Studies are under way to learn more about the distribution, range, and behavior of grey-shanked doucs. These studies will help experts to find more ways to conserve this species. A long-term study in the Gia Lai Provence is currently being conducted as a part of the Frankfurt Zoological Society's Vietnam Primate Conservation Program. On March 3, 2016, Fauna & Flora International announced that a new population of over 500 grey-shanked doucs had been discovered in Central Vietnam. ==References==