Common Name
Stripe-Naped Proboscis Monkey
Species
Nasalis larvatus
IUCN Status
Endangered
Common Classification
Old World Monkey
Range Countries
Indonesia, Malaysia, and Brunei
Habitat
Inhabit lowland tropical rainforest, mangrove, costal nipa palm, lowland, riverine and peat swamp forest
Physical Characteristics
- Head and Body length: male – 745 mm (730-760 mm); female – 620 mm (610-640 mm)
- Tail length: male – 665 mm (660-670 mm); female – 573 mm (550-620 mm)
- Weight: male – 21.2 kg; female – 10.0 kg
Distinguishing features
Common name "proboscis monkey" is given because the males of this species have an elongated hanging nose, this feature is not as pronounced with the females, juveniles have a nose that usually points upward and can be blue in color, noses are believed to be involved with attracting a mate or releasing excess body heat.
Upper parts of their coats vary from reddish brown to chestnut brown, under parts are usually a lighter color such as cream or gray, the crown and back are reddish orange, the shoulders, cheeks, nape and throat are a lighter orange, the face of an adult is pink, infants are born with a dark blue face, partially webbed feet, which are believed to be an adaptation for swimming and walking on the mud of mangrove forests, males have a red penis and black scrotum
Diet
Mostly eats leaves, but supplements diet with seeds, flowers and a small amount of animal prey
Behavior
Group size usually about 9 individuals but can vary anywhere between 4 and 20, typically choose habitat near riparian areas, good swimmers and will dive into water to escape danger, spend most of their time in trees, most active during the day
Threats
Habitat has dwindled dramatically since the cutting of their typical mangrove forest habitat has become economically feasible due to technological innovations
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