Bornean Orangutanボルネオオランウータン

Species Data

Classification

Primates / Hominidae Source

Size

Body length about 1.0–1.7 m; males have an arm span of about 1.5–2 m

Weight

Males average about 75 kg (50–100 kg), females about 38.5 kg (30–50 kg)

Lifespan

Wild: about 35–45 years; some captive individuals have lived about 60 years

Diet

Omnivore Omnivorous, using more than 400 kinds of food, chiefly fruit such as figs, durians, and mangosteens, along with leaves, seeds, flowers, sap, bark, honey, fungi, bird eggs, and insects

Activity

Diurnal and arboreal; feeds for 2–3 hours in the morning, rests around midday, and becomes active again in late afternoon

Distribution

The Bornean orangutan is endemic to the island of Borneo, found in patchy, declining populations across the Malaysian states of Sabah and Sarawak and the Indonesian Kalimantan provinces. Source

Sources

ja.wikipedia.org en.wikipedia.org

Did You Know?

• Bornean orangutans build an elaborate new nest of branches and leaves every night. They begin practicing this skill around six months of age and master it by about age three. Source
• Unlike other great apes, Bornean orangutans are largely solitary, with social bonds centered mainly on the mother-offspring relationship — a pattern often described as 'solitary but social.' Source
• Only dominant males develop the large facial cheek pads called flanges, using long calls to attract females; the development can be suppressed in subordinate young males. Source

FAQ

Why is the Bornean orangutan critically endangered?

Deforestation for logging and palm oil plantations has destroyed much of its habitat, and hunting adds further pressure — surveys estimated 750 to 1,800 orangutans killed annually in Kalimantan alone. The population is now less than 14% of historical levels. Source

Do orangutans use tools?

Yes. Bornean orangutans have been observed using leaves to wipe away feces, bundling leaves into a pad for handling spiny durian fruit, and using leafy branches to swat away bees. Source

Are orangutans solitary animals?

Mostly, yes. Unlike chimpanzees or gorillas, Bornean orangutans spend much of their adult lives alone, with the strongest social bonds forming between mothers and their offspring. Source

How many operating facilities are registered here?

Operating facilities registered on this site: Japan 6 Source

Books & gear

• Bornean Orangutan book
• binoculars