Delacour's langur
| Delacour's langur | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Primates |
| Family: | Cercopithecidae |
| Genus: | Trachypithecus |
| Species group: | T. francoisi |
| Species: | T. delacouri |
| Binomial name | |
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Trachypithecus delacouri (Osgood, 1911) |
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| Delacour's langur range | |
The Delacour's langur, or Delacour's lutung, (Trachypithecus delacouri) is a critically endangered species of lutung endemic to Vietnam. It is considered to be one of the world's most endangered primate species. It is named for French-American ornithologist Jean Théodore Delacour.
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. Males weigh between 7.5 and 10.5 kg (17 and 23 lb), while the females are slightly smaller, weighing between 6.2 and 9.2 kg (14 and 20 lb). Their fur is predominantly black, with white markings on the face and distinctive creamy-white fur over the rump and the outer thighs, while females also have a patch of pale fur in the pubic area. Like other closely related lutungs, Delacour's langur has a crest of long, upright, hair over the forehead and crown; this is, however, somewhat taller and narrower than in other species.
Delacour's langur is endemic to Vietnam, where it is found only in an area around 6,000 km2 (2,300 sq mi) in the provinces of Ninh Bình, Hà Nam, Hòa Bình, Thanh Hóa, and Hà Tây in the north of the country. The largest surviving population is believed to be in Van Long Nature Reserve in Ninh Bình, where the monkey inhabits open forest up to elevations of 328 m (1,076 ft), in terrain dominated by limestone karst.
Delacour's langurs are diurnal, often spending the day sleeping in limestone caves, although they sleep on bare rocky surfaces if no caves are available. They are folivorous, with about 78% of the diet reportedly consisting of foliage, although they also eat fruit, seeds, and flowers. The monkeys have been reported to eat leaves from a wide range of different plant species, indicating that their apparent dependence on limestone habitats is not related to their diet.
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Wikipedia