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Gray langurs have stable populations in some areas and declining ones in others. [62] Both the black-footed gray langur and Kashmir gray langur are considered threatened. [3] [20] The latter is the rarest species of gray langur, with less than 250 mature individuals remaining. [3] In India, gray langurs number at around 300,000. [63]
The northern plains gray langur belongs to the genus Semnopithecus along with the other Indian langurs. The southern plains gray langur was once classified as a subspecies of S. entellus, i.e., S. entellus dussumieri and later regarded as a separate species, i.e., S. dussumieri, but is now regarded as an invalid taxon.
Southern plains gray langur was the common name ascribed to Semnopithecus dussumieri by Mammal Species of the World (3rd edition) in 2005. [1] Along with several other Semnopithecus , it had been previously considered a subspecies of the northern plains gray langur , Semnopithecus entellus , i.e., Semnopithecus entellus dussumieri . [ 2 ]
The Kashmir gray langur (Semnopithecus ajax) is an Old World monkey, one of the langur species. It is a leaf-eating monkey. [2]It has been reported from Jammu and Kashmir and Himachal Pradesh in northwestern India but evidence indicates it only occurs in the Chamba Valley in Himachal Pradesh.
Tufted gray langurs communicate with many different ways such as barks, grunts, whoops, whistles and howls. The cough like voice is used for giving tension, and whistling for the contact loss with the troop. [4] The tufted gray langur monkey's superior eyesight and ability to sit atop high trees allows it to spot predators easily.
The Nepal gray langur (Semnopithecus schistaceus) is a gray langur endemic to the Himalayas in Nepal, far southwestern Tibet, northern India, northern Pakistan, Bhutan and possibly Afghanistan. It is found in forests at an elevation of 1,500 to 4,000 metres (4,900 to 13,100 ft). [ 1 ]
The Tarai gray langur (Semnopithecus hector) is an Old World monkey, and was formerly considered a subspecies of the northern plains gray langur. The species is listed as near threatened , as there are probably not many more than 10,000 mature individuals, and it is experiencing a continuing decline.
The Indochinese grey langur (Trachypithecus crepusculus) is a species of Old World monkey native to East and Southeast Asia. Taxonomy