Orangutan

Orangutan facts at a glance

What is a group of orangutans called?

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Behavior and intelligence

Orangutans are among the most intelligent animals, capable of using and even making simple tools, such as sticks to extract insects or leaves used as umbrellas and gloves. They are largely solitary compared with other great apes, with adult males living alone and females accompanied only by their offspring. They build a fresh nest of branches and leaves high in the trees to sleep each night. Their name comes from Malay words meaning "person of the forest."

Diet and feeding

Orangutans are omnivores whose diet is dominated by fruit, especially energy-rich figs and the spiky durian. They also eat leaves, bark, flowers, insects, and occasionally eggs. Because fruiting is patchy in the rainforest, orangutans range widely and remember the locations and seasons of fruit trees across large areas. By spreading seeds in their droppings, they help regenerate the forest.

Habitat and range

Orangutans live only on the islands of Borneo and Sumatra in Southeast Asia, where they inhabit tropical lowland and peat-swamp rainforests. They are the most arboreal of the great apes, spending almost all their time in the canopy and rarely coming to the ground. There are three species: the Bornean, Sumatran, and the recently described Tapanuli orangutan, all of which are critically endangered. Their survival is tightly linked to the health of intact forest.

Conservation

All orangutan species are Critically Endangered, with numbers falling rapidly due to logging, conversion of forest to palm oil plantations, fires, and the illegal pet trade. Females reproduce very slowly, giving birth only once every six to eight years, so populations recover poorly from losses. Conservation efforts include protecting and restoring forest, rehabilitating rescued orphans, and promoting sustainable palm oil. Without urgent action, wild orangutans face a real risk of extinction.

Did you know? Orangutan facts

• Orangutans are the largest tree-dwelling mammals and Asia's only great ape.
• Their name means 'person of the forest' in Malay.
• They share around 97% of their DNA with humans.
• Orangutans build a fresh sleeping nest in the trees almost every night.
• Mothers care for a single infant for up to eight years — among the longest of any animal.
• All orangutan species are critically endangered, mainly from habitat loss.

Diet & feeding

Orangutans are predominantly frugivorous, especially fond of figs, and also eat leaves, bark, insects, and occasionally eggs, tracking fruiting trees across their range.

Adaptations

• Long, powerful arms with a span up to 2 m suit a life moving through the canopy.
• Hook-like hands and feet grip branches for climbing and feeding.
• A large brain supports tool use, memory of fruiting trees, and problem-solving.
• Flanged adult males develop large cheek pads that amplify long calls.

Behaviour & ecology

• Orangutans are largely solitary, with adult males and females ranging alone.
• They build new nests nightly from bent and woven branches.
• Long mother–infant dependency transmits feeding knowledge across years.
• Males give a booming 'long call' to advertise presence and deter rivals.

Communication

• Flanged males produce far-carrying long calls to space themselves and attract females.
• A range of grunts, kiss-squeaks, and gestures feature in close interactions.
• Some populations use tools and learned signals passed between individuals.

Habitat & range

Orangutans live in the tropical rainforests of Borneo and Sumatra, depending on continuous canopy and fruiting trees; habitat clearance has fragmented their range.

Ecological role

As major fruit-eaters, orangutans are vital seed dispersers that help regenerate Southeast Asian rainforests, making them a flagship for forest conservation.

Conservation status of the Orangutan

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Orangutan:

• IUCN Red List of Threatened Species

  Conservation status (Critically Endangered) reflects the IUCN Red List category for Pongo pygmaeus, most recently assessed in 2016.

• Ancrenaz, M. et al. (2016). Pongo pygmaeus. IUCN Red List of Threatened Species.

  Status (Critically Endangered) and threats.

• Animal Diversity Web — Pongo pygmaeus. University of Michigan Museum of Zoology.

  Life history, morphology, and range.

• Nowak, R. M. (1999). Walker's Mammals of the World (6th ed.). Johns Hopkins University Press.

  Morphology and biology.

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.