Orangutan (Bornean) / Pongo pygmaeus pygmaeus

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It is the only great ape to be found in Asia

Fossil remains from mainland Asia show that some orangs were larger than gorillas

Males have cheek pads to show their maturity and status

Males also have large throat pouches which amplify their calls

The orangutan is not a monkey, but a great ape, like the chimpanzee and gorilla and, like them, lacks a tail and has long arms.

They are the most arboreal, or tree dwelling, of the great apes with only large adult males spending lengthy periods on the forest floor.

They are strictly day-active, spending the night in a tree-nest made from branches. They move through the branches using all four limbs.

They are the least social of the great apes with adults only associating with each other during the breeding season. Males have cheek pads, or flanges – see image, right – to show their maturity and status.

Sub-adult, or unflanged, males will try to mate with any female and will be successful around half the time.

Dominant, or flanged, males will call and advertise their position to females.

Following a gestation period of nine months females give birth.

The Bornean orangutan is the slowest breeding of all mammal species, with an interval of approximately eight years between births.

Newborn orangutans nurse every three to four hours, and begin to take soft food from their mothers’ lips by four months.

During the first year of its life, the young clings to its mother’s abdomen by entwining its fingers and gripping her fur.

A young orang is weaned at four years, and at around five years they will actively seek other young orangutans for play.

The Bornean orangutan is an omnivore with a diet which is composed of more than 400 types of food, including wild figs, eaves seeds and bark, plus birds eggs and insects.