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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]
The northern plains gray langur is listed as least concern on the IUCN Red List, it is threatened by habitat loss. [2] The northern plains gray langur adapts to many habitats and the Hindu religion considers the northern plains gray langur to be sacred. [7] Hence it has large population within India, including within towns and cities. [7]
Delacour's langur or Delacour's lutung (Trachypithecus delacouri) is a critically endangered species of Old World monkey endemic to northern Vietnam. [1] It is named for French-American ornithologist Jean Théodore Delacour .
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]
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 ]
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 purple-faced langur (Semnopithecus vetulus), [1] also known as the purple-faced leaf monkey, is a species of Old World monkey that is endemic to Sri Lanka. The animal is a long-tailed arboreal species, identified by a mostly brown appearance, dark face (with paler lower face) and a very shy nature.
Dusky leaf monkeys (Trachypithecus obscurus). Cercopithecoidea is a superfamily of primates.Members of this family are called cercopithecoids, or Old World monkeys, and include baboons, colobuses, guenons, lutungs, macaques, and other types of monkeys.