Critically Endangered
Delacour's langur
Trachypithecus delacouri
Delacour's langur or Delacour's lutung is a critically endangered species of Old World monkey endemic to northern Vietnam.
Appearance
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.
Adults measure from 57 to 62 cm (22 to 24 in) in head-body length, with a tail 82 to 88 cm (32 to 35 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).
Range and habitat
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 capital Hanoi and provinces of Ninh Bình, Hà Nam, Hòa Bình, Thanh Hóa in the north of the country. The largest surviving population is thought to live in Van Long Nature Reserve in Ninh Bình, where the it inhabits open forest up to elevations of 328 m (1,076 ft) in terrain dominated by limestone karst. Delacour's langur or Delacour's lutung is a critically endangered species of Old World monkey endemic to northern Vietnam.
Since that time, two of the populations have been extirpated, and only that in the Van Long Nature Reserve may still be large enough to remain viable.
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Diet and breeding
Delacour's langurs are diurnal, spending daylight hours exploring their home range and often sleeping on open rock surfaces or in limestone caves at night. 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.
The fur begins to turn black at around four months, and the young are probably weaned at 19 to 21 months, when the mother is likely ready to breed again.
In crisis
The population of Delacour's langurs has declined rapidly in recent years. As of 2006, only 19 populations were known, following a dramatic decline in the total population of approximately 20% between 1999 and 2004. Classified as critically endangered by the IUCN, the primary threat to the species is hunting for traditional medicine, with loss of forest habitat and the local development of tourism also being a potential risk.
As of 2010, less than 250 animals were believed to remain in the wild, with nineteen in captivity.
CITES lists this taxon on Appendix II. Confirm the current appendix on the CITES checklist.
Delacour's langur is Critically Endangered on this catalog because that is the IUCN category stored on Wikidata. Confirm the official criteria and any later count on iucnredlist.org.
Sources
Written for this catalog from the English Wikipedia article on Delacour's langur, Wikidata item Q681546. Family and order context is original field-guide writing about the group, not a copied assessment of this one species. Wikipedia text is CC BY-SA. Not an IUCN assessment. Counts, when quoted, can change — confirm them on the recovery programme and on iucnredlist.org.
