Delacour's Lutung (Trachypithecus delacouri) lives in tropical rainforest across Southeast Asia. It feeds on leaves and fruits. Its conservation status is Critically Endangered.
Fascinating facts about the Delacour's Lutung
- Delacour's langur is restricted to a tiny 6,000 km² region in northern Vietnam, occurring only around the capital Hanoi and the provinces of Ninh Bình, Hà Nam, Hòa Bình and Thanh Hóa. Within this narrow range the species survives in fragmented forest patches. The most substantial remaining community is believed to reside in Van Long Nature Reserve in Ninh Bình, where conservation efforts are focused.
- The biggest remaining group of Delacour's langurs occupies Van Long Nature Reserve, where they move through open forest that clings to limestone karst formations. They are found at elevations up to 328 m, navigating the rugged cliffs and caves that dominate the landscape. Their preference for this terrain provides shelter and sleeping sites on exposed rock surfaces. The karst environment therefore shapes both their daily movements and their social distribution.
- Approximately 78 % of the Delacour's langur's diet consists of leaves, classifying it as a folivore, but the monkeys also supplement with fruit, seeds and flowers. Observations show they consume foliage from a wide variety of plant species, demonstrating dietary flexibility. Because their food sources are not tied to the limestone substrate, the species' apparent reliance on karst habitats is driven by shelter rather than nutrition.
- Earlier surveys recorded Delacour's langur troops of up to 30 individuals, mixing males and females and sometimes forming all-male groups. In recent years the typical group size has shrunk to only four to 16 members, reflecting the species' decline. Males still defend territory by standing watch on rocky outcrops and using loud hoots and visual displays before resorting to chases.
- By 2010 fewer than 250 Delacour's langurs were thought to survive in the wild, with only nineteen individuals held in captivity. This tiny number underscores its critically endangered status and the rapid decline noted since the early 2000s. The species' range is limited to about 6,000 km² in northern Vietnam, and the only viable wild population is believed to be in Van Long Nature Reserve.
Sources
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At a glance
RangeSoutheast Asia
HabitatTropical rainforest
DietLeaves and fruits
About the Delacour's Lutung
In the mist-shrouded forests of Vietnam, a rare and elusive creature glides through the trees with effortless elegance, its sleek, black coat glistening like polished onyx as it navigates the dense foliage with precision. The Delacour's Lutung, a langur of haunting beauty, moves with a quiet confidence, its large, dark eyes scanning the surroundings with a deep intelligence, as if aware of the precarious balance between its own survival and the fragile ecosystem it inhabits. As it leaps from branch to branch, its slender form seems to embody the very essence of its endangered world, a fleeting glimpse of a vanishing treasure.
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