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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.
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.
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.
Cat Ba langurs were used to make a "monkey balm" believed to help with erectile dysfunction and other health issues. Since the langurs are so few, hunting takes two to four weeks. A hunter can earn up to $50 from a single langur, which is a lot when the average annual per capita income is less than $350. [15]
Gee's golden langur is found in an area of approximately 30,000 square kilometres (12,000 sq mi), much of which is unsuitable habitat, [21] bounded on the south by the Brahmaputra River, on the east by the Manas River, on the west by the Sankosh River, in Assam, India, and on the north by the Black Mountains of Bhutan. [22]
Female langurs hold a pregnancy for 195–210 days, and after the birth the offsprings are taken closely cared for by the mother until they are about 12–20 weeks old. Western purple-faced langurs are tree-dwelling animals, and live in groups of up to 14, where a harem of female monkeys, their offsprings and a male in a position of superiority ...
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]
The dusky leaf monkey (Trachypithecus obscurus), also known as the spectacled langur or the spectacled leaf monkey, is a species of primate in the family Cercopithecidae. It is found in Peninsular Malaysia , Myanmar and Thailand , [ 2 ] and can occasionally be found in Singapore . [ 3 ]