Sumatran orangutans grow to about 1.7 m tall and 90 kg, while females are smaller, averaging 90 cm and 45 kg. Compared to the Bornean species, Sumatran orangutans are thinner and have longer faces; their hair is longer and has a paler red color.

Evolution

Fossil orangutans in Sumatra from the Pleistocene had similar diets to present day Sumatran orangutans, consisting mainly of soft fruit as evidenced by dental microwear.

Behaviour and ecology

1.Previous
3.Next