This unusual monkey is only endemic to the island of Borneo. In eastern Sabah, it is most often found in mangrove forest, mixed mangrove and nipah and in river edge forest. It is most active in the day and late afternoon when leaving or moving to sleeping sites, usually on a river bank. It has a beautiful fur. Infants have dark blue face. Male proboscis are easily recognised by their long, drooping noses. Female and young proboscis monkeys have short, upturned noses. Diet includes leaves, fruits and shoots of mangrove trees.
Habitat destruction and hunting is the major threat to the survival of the proboscis monkey in Sabah. As this species of monkey is a protected animal under the Fauna Conservation Ordinance, 1963 the Sabah Wildlife Department is trying to upgrade all land status where proboscis monkey is found.
Source : Wildlife of Sabah In Danger, Sepilok Orang Utan Rehabilitation Centre, Sabah Wildlife Department, 1993.