Proboscis Monkey Fact Sheet

Common Name:

Proboscis Monkey

Scientific Name:

Nasalis larvatus

Wild Status:



Coastal areas and along rivers


Brunei, Indonesia, Malaysia


Tree tops

Life Span:

20 ys in the wild; 25 yrs in captivity


Females: head to body length 21-25"; Makes: head to body length 26-30"

Cool Facts:

  • Adult proboscis monkeys have a cream colored face. they are born with a blue face and transition to a a grey color between 2.5 and 8.5 months of age.
  • Many of their toes are webbed as an adaptation of their environment.
  • Proboscis monkeys live in groups. These groups live closely together and will often travel, sleep, and gather with little to no aggression; however, they will only play and groom with others in their group.
  • This species is folivorous and frugivorous feeding primarily on leaves and fruit.


The proboscis monkey is one of the largest species of monkeys found in Asia, with males reaching a head-to-body lengthy of 26 to 30 inches. Females are about half their size and weight. They get their names from their enlarged nose, known as a proboscis. Males can have a proboscis exceeding 4 inches in length, hanging lower than their mouths. On the other hand, females have enlarged noses as well, but they are not as large as their male counterparts. Proboscis monkeys have long cream colored hair covering their extremities. They typically have orange and reddish brown, on their backs and stomachs. Brick-red hair covers their heads and forehead. Their undercoat has shades of grey, yellow, and orange.  

Taxonomic Breakdown:

Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Primates Suborder: Haplorhini Infraorder: Simiiformes Family: Cercopithecidae Genus: Nasalis Species: N. larvatus

Conservation & Helping:

The proboscis monkey is considered endangered. They are protected in all of Borneo through many laws and protected areas. Nonetheless, they are highly vulnerable to habitat loss due to logging, oil palm plantations, and illegal hunting. in 2008, it was assessed that the proboscis monkey had lost more than 50%  of its population.

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