Fauna
Mammal

Delacour's Langur

Trachypithecus delacouri

Also known as Delacour's Lutung, White-rumped Black Langur

Delacour's langurs navigate the shear limestone cliffs of northern Vietnam with incredible agility, leaping effortlessly between vertical rock faces and dense canopy cover. Distinctive white fur wrapping around their lower backs and thighs gives them the appearance of wearing white shorts against an otherwise jet-black coat. Living in tight-knit matriarchal troops, they spend their days foraging on tough leaves and sheltering inside cool karst caves at night.

EndemicKarst SpecialistDiurnal
Delacour's Langur reference1 / 7
Chermundy / CC BY-SA 3.0 · cc-by-sa
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Critically EndangeredConservation statusIUCN Red List categoriesLCNTVUENCREWEXCritically EndangeredRed List categories, explained →
Key facts
Diet & preyLeaves, Wild Fruits, Plant Shoots
Predators
  • Indochinese Leopard
  • Reticulated Python
  • Black Eagle
ThreatsPoaching for traditional medicine and limestone quarrying
HabitatsTropical karst limestone forests and cave systems
Life span18–25 years
Classification
  1. FamilyCercopithecidae
  2. SpeciesTrachypithecus delacouri
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Capable of delivering a sharp bite if cornered; keep a respectful distance when observing in the wild.
What to notice
Striking jet-black primate featuring a bright white patch across its rump and thighs resembling shorts.
Support conservation
Observe quietly from designated boat tours, avoiding loud noises, drones, or publicizing unmonitored troop locations.
Responsible observation
  • Observation Spotting: Scan high limestone cliffs early in the morning as troops emerge from roosting caves.
  • Ethical Viewing: Use long telephoto lenses or spotting scopes from boats to avoid disturbing wild troops.
  • Local Guides: Hire certified rangers in protected areas like Van Long Wetland to ensure safe, responsible encounters.
Related species
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