Jun 29
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Endangered Species of the Week: Sumatran orangutan

Photo of Sumatran orangutan with infant

Sumatran orangutan (Pongo abelii)

Species: Sumatran orangutan (Pongo abelii)

Status: Critically Endangered (CR)

Interesting Fact: The name ‘orangutan’ means ‘person of the forest’.

The Sumatran orangutan lives almost exclusively in trees, only very rarely coming down to the ground. This large Asian ape is found in lowland tropical rainforests and swamps in northern Sumatra, and feeds mainly on fruit, although it will also eat leaves, termites, and even occasionally the meat of slow lorises. The Sumatran orangutan is distinguished from the Bornean orangutan by its narrower face, longer beard and lighter fur, and the two species also behave slightly differently. Adult male orangutans are larger than females, and may have large cheek pads on either side of the face. Orangutans are long-lived and breed very slowly, with females only producing an infant around once every eight years, giving them the longest inter-birth interval of any land mammal.

The main threat to the Sumatran orangutan is the loss of vast areas of forest due to illegal logging, mining and conversion to agriculture, particularly oil palm plantations. Forests have also been fragmented by roads, and forest loss and fragmentation make orangutans more vulnerable to being captured for the illegal pet trade. This species’ slow reproductive rate makes it very difficult for its populations to recover from any losses. The Sumatran orangutan is fully protected by law and is listed on Appendix I of CITES, which bans international trade in this species. However, the key to saving this charismatic primate lies in protecting its remaining forest habitat. A major stronghold for the Sumatran orangutan lies in the Leuser Ecosystem Conservation Area, and projects are also underway to rescue and rehabilitate orangutans that have been orphaned or confiscated, and, if possible, to return them to the wild.

 

Find out more about orangutan conservation at the Orangutan Foundation and Great Apes Survival Partnership.

You can also find out more about Sumatra and its wildlife on the ARKive Indian Ocean islands page.

See images and videos of the Sumatran orangutan on ARKive.

Liz Shaw, ARKive Text Author

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