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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]
Trachypithecus (derived from Greek τραχύς, trachýs meaning "rough" and πίθηκος, píthekos meaning "monkey") is a genus of Old World monkeys containing species known as lutungs, langurs, or leaf monkeys.
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.
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.
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 black-footed gray langur was previously considered to be a subspecies of Semnopithecus entellus. Research done in 2003 by Brandon-Jones may indicate that it is a subspecies of Semnopithecus dussumieri. Some experts believe that the species may be a naturally occurring hybrid of Semnopithecus johnii and Semnopithecus dussumieri.
Black-footed gray langur, (Semnopithecus hypoleucos) Nilgiri langur (Trachypithecus johnii) Two subfamilies are recognized, the Cercopithecinae, which are mainly African, but include the diverse genus of macaques, which are Asian and North African, and the Colobinae, which includes most of the Asian genera, but also the African colobus monkeys.
Presbytis is a genus of Old World monkeys also known as langurs, leaf monkeys, or surilis. Members of the genus live in the Thai-Malay Peninsula , on Sumatra , Borneo , Java and smaller nearby islands.