Purple-faced langur  (Trachypithecus vetulus)

Arboreal: Living in trees.
Diurnal: Active during the day.
Endemic: A species or taxonomic group that is only found in one particular country or geographic area.
Folivorous: Leaf eating.
Subspecies: A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.

1. IUCN Red List (November, 2008)
   http://www.iucnredlist.org
   
2. Richardson, M. (2006) Pers. Comm.
   
3. CITES (November, 2005)
   http://www.cites.org
   
4. Paleorama (February, 2006)
   http://www.paleorama.com/Mammals-T/Trachypithecus_vetulus.php
   
5. The Primata (November, 2005)
   http://www.theprimata.com/trachypithecus_vetulus.html
   
6. Primates in Peril: The World's 25 Most Endangered Primates 2004 – 2006 (November, 2005)
   http://portals.conservation.org/downloads/storedfile/Document/top252004final.pdf