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Presbytis canicrus
Basic stats
Diet
Young leaves and shoots (dominant), unripe fruit, eggs, seeds, flowers
Habitat
Dipterocarp rainforest up to about 1,000m
Range
Endemic to East Kalimantan, from the central coast to Kutai National Park and Wehea Forest
Litter size
1
Gestation period
About 5.5–6 months (typical for Presbytis langurs)
Size
Medium (head-body 48–56cm, tail 65–84cm)
Weight
Males 6–7kg; females 5.5–6kg
One of the rarest and most range-restricted of Borneo's langurs, split from Hose's langur in 2014 and known only from a small part of East Kalimantan. Grizzled iron-grey upperparts with whitish-tipped hairs, a black crown crest, and a face that is blackish down to a line between mouth and ear, turning whitish-buff below it — a combination distinguishing it from Hose's langur's pink, black-striped face and the Sabah grey langur's wholly brownish crown. Infants are born white with a striking black cross marking across the back.
Feared possibly extinct until a population was confirmed in Wehea Forest in 2012. Ecology is assumed to mirror other Presbytis langurs — small folivorous troops in the mid-canopy — but detailed field study remains limited given the species' rarity and tiny range. Critically Endangered (IUCN, assessed 2021), and historically listed among the world's 25 most endangered primates.
