Only found on the island of Borneo, the Proboscis Monkey is amongst the most distinct looking of the world’s primates. Once widely distributed around coastal mangroves and large rivers all over this huge island, they are now considered an Endangered species and remain only in pockets of habitat that have not been destroyed, and where they have not been hunted out.
Proboscis Monkeys are closely related to the langurs, or leaf monkeys, that are widespread through the tropical parts of Asia. These monkeys, including the Proboscis, are leaf-eating monkeys able to digest cellulose. Yet the Proboscis looks very different than the other langurs, most notably with their large nasal appendage, particularly pronounced in adult males. This appendage appears to amplify the calls of the big males, and is a sign of health and vigour. These large males control harems of up to 32 monkeys, continuously defending them from rival males. Other males not in control of harems form all-male groups.
In the riparian areas where they are most densely populated, groups of Proboscis Monkeys are a common sight in the early and late parts of the day. They typically roost in large trees overhanging a river at night, and spend the cool hours of the early morning and late afternoon engaging in various social interactions. During our Borneo Rainforest Wildlife tour, we will be sure to spend some memorable sessions watching these spectacular primates by boat from the Kinabatangan River. This protected area is home to one of the highest densities of this species remaining, along with a host of other wonderful primates including Bornean Orangutan, Bornean Gibbon, Pig-tailed Macaque, Long-tailed Macaque, Silvery Langur and Red Leaf Monkey. Truly one of the world’s finest primate watching sites!
If you’re interested in joining us on a tour to Borneo, be sure to contact us.