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The populations formerly regarded as southern plains gray langur are among the smaller gray langurs, with a height of about 62 cm (24 in), a tail longer than the body and a weight of about 12 kg (26 lb). The hair on the top of their heads are cream-coloured, the body fur is grayish-brown or purplish-brown and the underparts are yellowish.
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.
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.
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.
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.
Miller's langur is a leaf monkey within the family Cercopithecidae and subfamily Colobinae. [2] It was formerly considered a subspecies of Hose's langur, Presbytis hosei (as Presbytis hosei canicrus). [3] [2] [4] [5] It was split from P. hosei on the basis of different morphology by primatologists Colin Groves and Christian Roos. [3] [6]
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 ]