The Francois langur is glossy black with white hair on the cheeks that extend from the corner of the mouth to the ears, and a high pointed crest on the head. Very similar in appearance to the Hatinh langur, they can be distinguished by the absence of white hair on the upper lip and that they hold the tail up and away from the body, whereas the Hatinh holds its tail up and over the body. Males and females differ little in size, weighing between 6.5 and 7.8kg for males and 5.5 to 7.9kg for females with an average head and body length of 56cm. Females possess a distinctive 'pubic patch' of white fur and pale skin anterior to the callosities.
The Fransois langur can be found in Southern China and Northeastern Vietnam.
HABITAT AND ECOLOGY
Francois langurs prefer semi-tropical monsoon, moist tropical and subtropical rainforests in limestone. This species is mostly folivorous, with the remainder of the diet consisting of shoots, fruits, flowers, and bark. The average group size is 9-10 individuals, consisting one adult male, multiple adult females and offspring. Males and females reach sexual maturity in five and four years, respectively.
In Vietnam the main threats to this species are hunting for traditional medicine, and habitat fragmentation due to resource extraction in karst and the expansion of agricultural land. In China hunting pressure is very high due the production of 'black ape wine' made specifically from this species.
STATUS AND CONSERVATION
The species is protected in Vietnam and China. in Vietnam it is listed as Endangered in the 2007 Vietnam Red Data Book and is protected by law under Decree 32/2006 ND-CP:1B.
CITES Appendix II- International trade must be controlled in order to avoid utilisation incompatible with their survival.