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- The proboscis monkeys are large, sexually dimorphic, and arboreal colobinae or leaf monkeys endemic to the island of Borneo.
- The monkeys can be found in the waterlogged forests near coastal area such as riparian, mangrove, and swamp forests where they are closely related to the waterways.
- Proboscis monkeys live in groups called harems which are typically comprised of one adult male, 5 adult females, 3 juveniles, and 4 infants with an average of 15 individuals.
- The monkeys sleep on trees by the riverbank at night allowing them to be easily observed early morning before they move into the forest and in the late afternoon when they coming back to their sleeping sites.
- In the Malaysian state of Sabah, the population was estimated close to 6,000, a large proportion of which are located in the east coast along the lower parts of Kinabatangan and Segama regions.
- The endemic status of the proboscis monkeys together with their specific habitat preferences make them vulnerable to many anthropogenic threats such as logging, habitat conversion, and hunting.
- The World Conservation Union (IUCN) currently listed the proboscis monkeys as threatened and vulnerable to extinction if no further intensive conservation efforts are taken.