Orangutan Facts

Life in the Canopy

Orangutans spend most of their lives high in the rainforest canopy, where they feed, travel, rest and raise their young. Their exceptionally long arms, powerful hands and strong grip help them move carefully through the trees, although orangutans, especially adult males, also travel on the ground.

Rather than leaping rapidly from branch to branch, orangutans usually move slowly and deliberately. They test branches before placing their full weight on them and may sway smaller trees back and forth until they can reach the next part of the canopy.

Orangutans are the most solitary of the great apes, but they are not completely solitary. Adult females generally travel with their dependent young, while mature males range across large, overlapping home ranges and communicate using deep, echoing long calls.

Intelligent Forest Dwellers

Orangutans are known for their remarkable memory, patience and problem-solving abilities. They can remember the locations of fruiting trees, recognize seasonal changes in the forest and plan routes through large and complicated territories.

In some populations, orangutans have been observed using sticks to extract insects, seeds or honey from difficult-to-reach places. They may also use leaves as gloves, napkins, umbrellas or drinking tools, adapting objects in their environment for different purposes.

Young orangutans spend years watching and learning from their mothers. Through observation, practice and experience, they gradually learn how to find food, build nests, avoid danger and survive independently in the rainforest.

What Do Orangutans Eat?

Orangutans eat a varied forest diet dominated by fruit, including figs, durians and other seasonal fruits. They also eat leaves, bark, flowers, seeds, insects and occasionally honey. What they eat changes with what is available, so orangutans must remember where different foods can be found across large areas of forest.

Finding enough food in the rainforest requires an extraordinary amount of knowledge. Orangutans eat hundreds of different forest foods, but fruiting trees are scattered and unpredictable. Young orangutans spend years learning from their mothers what to eat, how to open difficult foods and where to search when familiar trees are bare. They also disperse seeds as they travel, but that is only one result of a much more complex challenge: learning how to survive independently in the rainforest.

Some of the fruits orangutans eat

Daily Nest Builders

Every evening, orangutans typically build a sleeping nest high in the trees, usually constructing a new one rather than reusing an old nest. They begin by bending and weaving strong branches together to create a secure platform capable of supporting their weight throughout the night.

Once the main structure is complete, they may add smaller branches and leafy material to make the nest more comfortable. Some orangutans create leafy cushions, blankets or overhead coverings that provide additional protection from wind and rain.

Nest building is a skill that young orangutans learn by watching their mothers. Juveniles often practise making small or incomplete nests before they are able to construct the strong, carefully designed sleeping platforms used by adults.

A Long Childhood

Young orangutans remain with their mothers for many years, longer than almost any other animal apart from humans. An infant depends completely on its mother for transportation, protection, food and guidance during the earliest stages of its life.

As the young orangutan grows, it begins exploring nearby branches while remaining close to its mother. It watches what she eats, follows her through the canopy and gradually learns which plants are safe, where fruiting trees can be found and how to recognize potential danger from venomous snakes and scorpions and other hazards of the rainforest.

This long learning period is essential because survival in the rainforest requires an enormous amount of knowledge. A young orangutan must master thousands of decisions before becoming independent, which is one reason the loss of an adult female can have such devastating consequences for her offspring.

How Long Do Orangutans Live?

Orangutans can live for more than 50 years in the wild, although exact lifespan is difficult to measure because following the same wild individuals from birth to death can take decades. In professional zoological care, a small number have lived into their 60s.

Their long lives are part of an unusually slow life history. Young orangutans remain with their mothers for years, and wild females give birth only about once every 7–8 years on average, so populations recover very slowly when adults are lost.

Flanged and Unflanged Males

Adult male orangutans occur in two very different forms. Flanged males develop large cheek pads, an enlarged throat sac and much greater body size, while unflanged males can be sexually mature and capable of fathering offspring without those features. Flanged males are generally dominant over unflanged males, and the presence of a dominant flanged male may sometimes delay flange development in others, but dominance is not known to act as a simple trigger. Age, hormones, physical condition and the social environment all appear to play a role, and some males remain unflanged for many years or even throughout life. Once flange development begins, the change appears to be irreversible.

Built for the Treetops

An orangutan’s arms can stretch much farther than its legs, making its body perfectly adapted for life above the ground. A mature orangutan may have an arm span considerably greater than its standing height, allowing it to reach across wide gaps between branches.

Flexible shoulders, curved fingers and powerful grasping hands help orangutans climb and suspend themselves beneath branches. Their feet can also grip like hands, providing additional balance and support as they move through the canopy.

These adaptations allow orangutans to travel through the forest while placing relatively little weight on any single branch. However, when forests are cleared or fragmented, gaps in the canopy can force them onto the ground, where they face greater risks from people, vehicles, fires and other dangers.