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Male Bornean orangutan (Pongo pygmaeus) studying a wooden trunk.

Male Bornean orangutan (Pongo pygmaeus) studying a wooden trunk.

Apenheul Primate Park is unique. There is no other zoo in the world where you will find so many primates roaming freely among the visitors: more than 200 of the...
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Apenheul Primate Park is unique. There is no other zoo in the world where you will find so many primates roaming freely among the visitors: more than 200 of them! The monkeys are very friendly, and are harmless to you and your children, and they will come up close.
(Text: Apenheul)

The Bornean orangutan has a distinctive body shape with very long arms that may reach up to 1.5 metres in length. It has grey skin, a coarse, shaggy, reddish coat and prehensile, grasping hands and feet. Its coat does not cover its face unlike most mammals, although Bornean orangutans do have some hair on their faces including a beard and mustache. It also has large, fatty cheek pads known as flanges as well as a pendulous throat sac.

The male's face pad widens as he grows older.
Bornean orangutans are highly sexually dimorphic and have several features that differ between males and females. Males have much larger cheek pads, or flanges, that are composed of muscle and large amounts of fat. In females, the flanges are mostly composed of muscle. Males have relatively larger canines and premolars. Males have a more pronounced beard and mustache. The throat sac in males is also considerably larger. There are two body types for sexually mature males: smaller or larger. Larger males are more dominant but smaller males still breed successfully. There is little sexual dimorphism at birth.
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Nikon D800, Nikor 200-500 f-5.6 VR; f-5.6; 1-200 s; ISO 1600, No flash, VR=on, Captured at 310mm (after crop about 450 mm).
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