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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.
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 .
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.
Miller's langur (Presbytis canicrus), also known as Miller's grizzled langur or Kutai grey langur, is a species of leaf monkey. It is endemic to East Kalimantan on the island of Borneo in Indonesia. It is one of the world's most endangered primates, and was at one time thought to be extinct, until it was rediscovered in 2012.
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.
Scientists have recently discovered a new primate species in Myanmar’s central forest. However, the Popa langur, named after nearby Mount Popa, is tragically already on the verge of extinction.
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]
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.