Also known as the red ape, or the 'old man of the forest', orang-utans are the largest tree-living mammals.

Life span
59 years.

Statistics
Females have a body weight of 37kg, and males weigh 83kg.

Physical description
Bornean orang-utans have a long-haired, red/brown coat. The molar teeth have thickened enamel - like human teeth. Males have a large throat patch and large cheek pads. Orang-utans are the largest arboreal (tree-living) mammals.

Distribution
This species inhabits Borneo, Asia.

Habitat
They live in the canopy of Borneo's tropical rain forests.

Diet
Fruit is the most important component of their diet, but they also feed on insects, small vertebrates, leaves and bark.

Behaviour
Adult male and female orang-utans are solitary. Females travel with their young until adolescence. They are diurnal and arboreal.

Reproduction
In captivity, female orang-utans have given birth as young as seven years old. Gestation is 244 days.

Conservation status
Orang-utans are classed as Endangered, due to deforestation of their habitat and through land conversion to palm oil plantations. Young orang-utans are still being captured for the pet trade. The estimated population of Bornean orang-utans is only 12,000-15,000.