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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.
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.
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.
The southern plains gray langur [1] 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]
Analysis of mtDNA confirms the Asian species form two distinct groups, one of langurs and the other of the "odd-nosed" species, but are inconsistent as to the relationships of the gray langurs; some studies suggest that the gray langurs are not closely related to either of these groups, [2] while others place them firmly within the langur group.
Like all langurs, this species' tail is noticeably long, measuring up to 98 cm in length while the body is only around 55 cm long. [4] The two subspecies of this monkey are fairly similar in appearance and are geographically separated; males and females are both usually glossy black, although the females pale, yellowish-white patch around the pubic area.
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]
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.