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Langurs mostly walk quadrupedally and spend half of their time on the ground and the other half in trees. They will also make bipedal hops, climbing and descending supports with the body upright, and leaps. Langurs can leap 3.6–4.7 m (12–15 ft) horizontally and 10.7–12.2 m (35–40 ft) in descending. [8]
"White-headed langur", Trachypithecus poliocephalus; Laotian langur, Trachypithecus laotum; Delacour's langur, Trachypithecus delacouri; Indochinese black langur, Trachypithecus ebenus; Since then, the T. vetulus group (the purple-faced langur and the Nilgiri langur) have been moved the genus Semnopithecus based on DNA and other evidence.
Delacour's langur is somewhat larger than its two closest relatives, François' langur and the Laotian langur, but in other respects has a similar appearance.Adults measure from 57 to 62 cm (22 to 24 in) in head-body length, with a tail 82 to 88 mm (3.2 to 3.5 in) long.
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.
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.
Cercopithecoids primarily eat leaves, fruit, and seeds. Most cercopithecoids do not have population estimates, but the ones that do range from 30 mature individuals to 100,000. Forty-eight species are categorized as endangered, and a further twenty-six species are categorized as critically endangered.
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 ]
François' langur (Trachypithecus francoisi), also known as Francois' leaf monkey, the Tonkin leaf monkey, or the white side-burned black langur [3] is a species of Old World monkey and the type species of its species group. It is one of the least studied of the species belonging to the Colobinae subfamily. [4]