Quick answer
Proboscis Monkeys typically weigh around 10–24 kg (22–53 lb); males much larger, with length and height varying by sex and population. Size influences diet (Herbivore — leaves, unripe fruit, seeds, and flowers), home range, and predator risk.
Key takeaway
Proboscis Monkeys typically weigh around 10–24 kg (22–53 lb); males much larger, with length and height varying by sex and population. Size influences diet (Herbivore — leaves, unripe fruit, seeds, and flowers), home range, and predator risk.
Typical Proboscis Monkey size
Adults are often described at 10–24 kg (22–53 lb); males much larger. Guides may list head-body length separately from tail; museum skins and live weights do not always match.
Males, females, and growth
Many species show sexual dimorphism. Juveniles reach adult mass over months to years; nutrition in Borneo mangroves, peat swamp, and riverine forest affects final size within genetic limits.
Why proboscis monkey size matters
Body size shapes diet (Herbivore — leaves, unripe fruit, seeds, and flowers), territory size, predator risk, and rough longevity patterns around 15–20 years in the wild.
Measuring proboscis monkeys
Live weights are hard to take; researchers use morphometrics, cameras, or carcass data. Treat tourist guesses cautiously.
Human interest and research
Proboscis Monkeys feature in folklore, tourism, and scientific study worldwide. Ongoing research tracks population trends, genetics, and responses to environmental change — data that guides national protection policies.
Distribution and habitat
Proboscis Monkeys live in Endemic to Borneo — mangroves, peat swamp, and riverine forest in Sabah, Sarawak, Kalimantan, and Brunei. Preferred habitat includes borneo mangroves, peat swamp, and riverine forest. Across Asia, population density reflects prey availability, water access, and human disturbance. Protected areas and wildlife corridors remain essential for long-term persistence.
Sources
Proboscis Monkey FAQs
How big is a proboscis monkey?
Proboscis Monkeys typically weigh around 10–24 kg (22–53 lb); males much larger, with length and height varying by sex and population. Size influences diet (Herbivore — leaves, unripe fruit, seeds, and flowers), home range, and predator risk.
What is the scientific name of the proboscis monkey?
Nasalis larvatus — used in research and conservation listings for proboscis monkeys.
What do proboscis monkeys eat?
Proboscis Monkeys eat leaves, unripe fruit, seeds, and flowers, with seasonal and regional variation in Borneo mangroves, peat swamp, and riverine forest.
Where do proboscis monkeys live?
They are associated with Borneo mangroves, peat swamp, and riverine forest. Local presence depends on food, cover, and human land use.
What is the conservation status of proboscis monkeys?
Listed in our guides as Endangered. Check the IUCN Red List and national assessments for the latest formal category.