istress signal.Longevity: They have been known to live up to 30 years in captivity.What is their conservation status in the wild?Douc langurs are one of the most endangered primates in the world. They are classifiedas endangered by the IUCN and the USDI and are on appendix 1 of the CITES. Bombingand defoliants during the Vietnam War destroyed most of the douc's habitat, from whichthey never fullly recovered. Also due to their appealing appearace, many douc langurbabies are used in the pet trade and never survive....