Details
Nasalis larvatus
The proboscis monkey is a diurnal primate tied to Bornean forests and freshwater. Social groups move along rivers and feed heavily on leaves.
Map: Ecoregions 2017 © RESOLVE (CC BY 4.0) · Natural Earth (PD)
It uses riverine forest, swamp forest, and mangrove edges. Waterside trees provide travel routes, food, and night resting sites.
Body length is about 53-76 cm and weight about 7-24 kg. A large male nose, rounded belly, long tail, and reddish coat are distinctive.
Diurnal and social, it moves through trees and may swim across channels. Groups often follow river corridors.
It is herbivorous, eating young leaves, fruit, and seeds. A specialized stomach helps ferment leafy, fibrous foods.
Infants are carried by the mother and grow within the group. They learn river-edge travel and feeding trees by moving with others.
Its status is listed as Endangered. Loss of swamp and riverine forest is a major threat, making connected waterside woodland important.
