Delacour's Langur is native to the limestone mountains and cliff areas of Vietnam. Groups will sleep in the caves of the limestone cliffs, using each cave for several nights before moving to another; they will also retreat into caves when threatened (Nadler 1996).

Although Trachypithecus delacouri prefers some tree species associated with limestone, they feed on a much broader spectrum of tree species and readily use other vegetation types and plant communities in the same geographical region (Nadler and Long 2001). According to scientific studies done by Nadler, the Delacour's langur eat leaves primarily, but also eat leaf buds, unripe fruit, flowers and flower buds. No instances of epizootics have been described for Trachypithecus delacouri. Some T. delacouri seized from poachers and held at the Endangered Primate Rescue Center, especially young ones and those that had earlier received antibiotic treatment, developed dermatophytes disease (Streicher 2001). Digestive system issues are common in the Delacour's langur such as, gastritis, duodenitis, jejunitis, and several forms of ileus.

Interactions with other organisms and species are not common for the Delacour's langur however, there are a few organisms that they will interact with. T. delacouris generally sympatric with the northern white-cheeked gibbon (Nomascusleucogenys), which, however, does not occur in the same habitat; 2 species of loris: pygmy slow loris (Nycticebuspygmaeus) and Bengal slow loris (N.bengalensis); and 3 species of macaque: Macaca mulatta, Assammacaque (M. assamensis), and stump-tailed macaque (Marctoides-Nadleretal. 2007).

References

NADLER ,T. 1996. Report on the distribution and status of Delacour's langur (Trachypithecus delacouri). Asian Primates Journal 6:1-4.

NADLER, T., AND H. T. LONG. 2001. Natural history and status review of the Delacour's langur (Trachypithecus delacouri). Preliminary report. Frankfurt Zoological Society, Hanoi, Vietnam.

MITTERMEIER, R.A., ETAL. 2007. Primates in peril: theworld's 25 most endangered primates, 2006-2008. Primate Conservation 22:1-40.

YEAGER, C. P., AND K. Koot., 2000. The behavioral ecology of Asian colobines. Pp. 496-514 in Old World monkeys (P. Whitehead and C. Jolly, eds.). Cambridge Press, New York.