Endangered
François' langur
Trachypithecus francoisi
François' langur is an Old World monkey in the family Cercopithecidae (order Primates) — Trachypithecus francoisi, recorded as Endangered.
Appearance
It has very distinct white sideburns that grow down from its ears to the corners of its cheeks. Infants are born with bright orange coloured fur, that fades to black throughout the period of infancy lasting several months. François' langur, also known as Francois' leaf monkey, the Tonkin leaf monkey, or the white side-burned black langur is a Old World monkey and the type species of its species group.
Males have a head-body length of 55–64 cm (22–25 in), while females are only 47–59 cm (19–23 in) in length. Males likewise have longer tails of 82–96 cm (32–38 in) compared to the 74–89 cm (29–35 in) for females.
Range and habitat
The preferred François' langur usually lives in a karst topography. Limestone cliffs and caves of tropical and subtropical zones. By living on these limestone cliffs, the langur is at an advantage when it comes to sleeping arrangements. François' langur has also been known to find sleeping sites in areas where the terrain is above 60 °F (16 °C), within evergreen forests.
Finally, a current project is underway by the Global Environmental facility to protect the Nonggang National and Dmingshan Natural Reserves and the langurs living within.
Habitat labels include forest.
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Diet
François' langur is diurnal and spends most of the day resting and foraging. One study investigated time distribution across activities in a disturbed environment, showing resting 35.41%, foraging 31.67%, traveling 14.44%, huddling 9.61%, playing 8.54%, and grooming 0.33%.
Over 50% of François' langur's diet is made up of leaves.
In crisis
The total number of wild individuals is unknown, but fewer than 500 are believed to be left in Vietnam and 1,400–1,650 in China. The population of François' langur has been on a steady decline for the past 30 years. In Guangxi province, an estimated 90% decline in numbers has occurred since the 1980s. A 2002–2003 survey found 307 individuals in 14 populations remained.
In 1983, the estimated population of François' langur was 4,000–5,000. The clouded leopard is a potential predator, but its numbers are low enough that it is not the langur's greatest threat.
CITES lists this taxon on Appendix II. Confirm the current appendix on the CITES checklist.
François' langur is 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 François' langur, Wikidata item Q545897. 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.
