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The northern plains gray langur is diurnal, and is both terrestrial and arboreal. [7] Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland. [2] Females groom members of both sexes but males do not groom others. [7] The northern plains gray langur can live in several different types of groups.
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.
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.
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 spends a greater part of its day travelling during the winter (20.12%) and huddling in the spring (14.62%). [8] François' langur lives in groups of 4 to 27 langurs, but will usually be found in groups around 12. [3] [9] It lives in a matriarchal society where the females lead the group.
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 classification of the Nilgiri langur has been disputed. Traditionally it has been placed within the genus Trachypithecus based on morphological similarities such as cranial morphology and neonatal pelage color, and within the Trachypithecus vetulus group within Trachypithecus based on a presumed close relationship with the purple-faced langur (Semnopithecus vetulus), which had formerly ...
It was formerly considered a subspecies of the Cat Ba langur (T. poliocephalus), which is now thought to be endemic to Vietnam. [2]Its taxonomy was previously uncertain; it has been considered a partially albinistic population of the François' langur (T. francoisi), a subspecies of Francois' langur, [3] a valid species (T. leucocephalus), or a subspecies, T. poliocephalus leucocephalus.