Javan Surili (Presbytis comata) lives in tropical rainforest across Southeast Asia. It feeds on leaves and fruits. Its conservation status is Vulnerable.
Fascinating facts about the Javan Surili
- Fewer than a thousand Javan surilis remain in the wild, a stark indication of their precarious status. Their forest home has shrunk dramatically, with only four percent of the original habitat still intact. This loss has driven a population decline of at least fifty percent over the past decade, pushing the species ever closer to the brink of extinction.
- The Javan surili possesses a sacculated stomach, a specialised chambered organ that breaks down the tough cellulose of the leaves it eats. This adaptation works together with its unusually large, round stomachs to maximise nutrient extraction from a fibrous diet. The monkey's small, slender face and tail complement its leaf-focused feeding habits, allowing it to efficiently browse the canopy.
- Leaves dominate the Javan surili's diet, with young leaves accounting for over sixty-two percent of what it consumes, the highest proportion among its genus. Mature leaves add another six percent, while the monkey also supplements its intake with flowers, fruits and seeds when available. This heavy reliance on foliage reflects its highly specialised folivorous feeding strategy.
- The fredericae subspecies of the Javan surili is one of the most endangered members of its species, confined to a small area of central Java where human settlement is dense. It lives close to an active volcano, a factor that adds further risk to its already precarious situation. Because it is among the rarest of the two recognised subspecies, its survival depends on protecting this heavily populated region.
- The Javan surili occupies both primary and secondary lowland rainforests across the western half of Java, thriving in forest patches that can reach high elevations. It is recorded at altitudes of up to 2,500 m, showing its ability to use a range of forest types from sea level to mountainous terrain. Its distribution stretches as far east as Mt Lawu on the border with East Java, highlighting a relatively wide but fragmented habitat.
Sources
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At a glance
RangeSoutheast Asia
HabitatTropical rainforest
DietLeaves and fruits
About the Javan Surili
In the lush, vibrant forests of Java, the Javan Surili moves with an air of quiet elegance, its slender form weaving effortlessly through the dense undergrowth as it forages for leaves and fruits. With large, expressive eyes and a mischievous glint, this endangered primate navigates its surroundings with a unique blend of caution and curiosity, its every movement a testament to the delicate balance of life in these fragile ecosystems. As it leaps from branch to branch, the Surili's agile form seems to embody the very essence of the forest, a fleeting glimpse of a world that is both beautiful and precarious.
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