Phayre's leaf monkey in cachar, Assam  

Phayre's leaf monkey (Trachypithecus phayrei), also known as Phayre's langur, is a species of lutung native to South Asia and Southeast Asia, namely India, Bangladesh, and Myanmar. Populations from further east are now thought to belong to other species. It is listed as Endangered on the IUCN Red List and is threatened by hunting and loss of habitat.
Cachar district of Assam is home of this endangered species.