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The larger gray langurs are rivals for the largest species of monkey found in Asia. The average weight of gray langurs is 18 kg (40 lb) in the males and 11 kg (24 lb) in the females. [7] Langurs mostly walk quadrupedally and spend half of their time on the ground and the other half in trees.
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.
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]
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 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.
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 .
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.
The Nilgiri langur (Semnopithecus johnii) is an Asian langur of the Old World monkey. It has glossy, black fur and an orangey-golden brown, hair-like mane on its head. Females have a white patch of fur on the inner thigh. It typically lives in troops of nine to ten individuals, with or without offspring, depending on seasonality.