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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.
The doucs or douc langurs make up the genus Pygathrix. They are colobine Old World monkeys , native to Southeast Asia , which consists of these 3 species: red-shanked douc , black-shanked douc , and gray-shanked douc .
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]
François' langur has been known to have approximately 6–10 regularly used sleeping sites that are used at various points throughout the year as water and food resources fluctuate. [13] François' langur has a restricted range of areas in which it can inhabit. It is primarily found in Southwest China and northern Vietnam.
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]
Miller's langur is a leaf monkey within the family Cercopithecidae and subfamily Colobinae. [2] It was formerly considered a subspecies of Hose's langur, Presbytis hosei (as Presbytis hosei canicrus). [3] [2] [4] [5] It was split from P. hosei on the basis of different morphology by primatologists Colin Groves and Christian Roos. [3] [6]
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 ...