Orangutan facts, pictures, video, and in-depth information. Learn about these critically endangered rainforest primates.
Orangutan Facts At A Glance:
- Other Name(s): orang-utan, orang utan
- Scientific name: Pongo pygmaeus (Bornean orangutan) and Pongo abelii (Sumatran orangutan)
- Type of Animal: mammal, primate
- Animal Family: Hominidae (subfamily: Ponginae)
- Where Found: Borneo (Bornean orangutan); Sumatra (Sumatran orangutan)
- Height: male 1.36 m (4 ft. 6 in); female 1.15 m (3 ft. 9 in)
- Weight: male 75 kg (165 lb.), female 37 kg (82 lb.)
- Arm span (male): 2m (6.6 ft.)
- Conservation Status: Critically Endangered
Other Orangutan Facts:
- ‘Orangutan’ means ‘man of the forest’ in local languages. (No, they weren’t named after the orange(ish) color of their fur, although it’s a good way to remember what they’re called!)
- Orangutans spend more time in the trees than any other species of great ape.
Meet the Orangutan…
Orangutans are large apes with distinctive red-brown hair. They live among the trees of tropical rainforests in Southeast Asia. Sadly, these intelligent primates are critically endangered, and their numbers are decreasing.
Two Species of Orangutan
There are two species of orangutan: the Bornean orangutan, found on the island of Borneo, and the Sumatran orangutan, found on the island of Sumatra. (You can find these locations on the map below.)
Orangutans have long, strong arms which reach nearly to the ground when the orangutan is standing. The arm span of a male is around 2 m (6.52 ft.). Although their legs are shorter than their arms, their hip joints are as flexible as their shoulders. Orangutans’ hands are large, and their fingers long and strong.
Orangutans have opposable thumbs. This means that the thumb faces the fingers and moves in the opposite direction – allowing the orangutan to pick things up.
Our thumbs are opposable too. Take a look at your hands and see how the position of your thumb allows you hold things.
Orangutans also have opposable big toes, which means that they can grip things with both their hands and their feet. (Sadly, our big toes aren’t opposable!)
In a resting position, the orangutan’s fingers are curled. This means that it doesn’t have to use as much energy when holding onto branches.
The orangutan’s long, powerful arms, flexible hips and gripping hands and feet are all adaptations for an arboreal (tree-dwelling) lifestyle. Orangutans are the largest arboreal mammals, and spend most of their lives in the trees.
Adult male orangutans are considerably bigger than adult females, and dominant males develop fleshy ridges – called ‘flanges’ – around their faces. Males also have large throat pouches that amplify the loud calls that they make in order to attract females. Not all males develop flanges and throat pouches.
Orangutan Facts: Behavior
Orangutans lead more solitary lives than the other great apes. Although they often interact with each other, they don’t live in troops as do their relations the gorillas and chimps.
Short-lived groups of adolescent males or females will occasionally form, but adults of both sexes generally live alone.
Adult females are more social than adult males, often living in territories that overlap those of female relatives.
Males with cheek flanges are the most solitary orangutans of all. They usually only come together with other orangutans in order to mate with females, or to protect their territories from other males.
A dominant male orangutan’s territory will include that of several females, and he will be their main mating partner.
Orangutans move by swinging from branch to branch and climbing with their strong, flexible limbs.
At night, orangutans sleep high in the trees in nests that they have made from leaves and branches. They usually build a new nest every night, and only rarely reuse a nest. Orangutans learn how to build nests by watching their mothers during the first few years of their lives.
Orangutan Intelligence & Tool Use
Orangutans are among the most intelligent of all primates. In the wild they use a variety of tools (made from sticks and other items found in the forest) in order to extract insects from trees or seeds from fruits. They have also been seen keeping themselves dry with ‘ponchos’ they have made out of large leaves.
Captive orangutans, and those living near humans, have been known to copy human behavior. Orangutans who watched workmen building huts learned how to use a saw to cut wood!
Scientists have taught orangutans to make signs and to recognize symbols.
Differences Between Sumatran and Bornean Orangutans
Both species of orangutan look broadly similar, and it was only until fairly recently (1996 in fact) that they were split into separate species.
Although both species are a similar size, Bornean orangutans are more heavily built, and tend to weigh more than Sumatran orangutans.
Bornean orangutans prefer lowland rainforests, whereas Sumatran orangutans are also found in mountain forests.
Orangutans walk on all fours, but spend little time on the ground. Bornean orangutans are more likely to be seen on the forest floor; Sumatran orangutans have probably had to adapt their behavior due to the presence of Sumatran tigers. However, both species spend most of their lives in the trees.
Sumatran orangutans have hair that is longer and paler in color than that of their Bornean cousins, and their faces are longer. Both male and female Sumatran orangutans have beards; a feature that is usually only found on male Bornean orangutans.
Where Do Orangutans Live?
You can see the location of the islands of Sumatra and Borneo on the movable map below. Zoom out to find out where the islands are in relation to other countries.
Sumatra is part of Indonesia, a country made up of thousands of islands. Most (almost 75%) of Borneo is also part of Indonesia. The rest of the island is shared between two other countries: Malaysia and Brunei. The Indonesian part is called Kalimantan.
Orangutans are the only type of great ape found in Asia.
Watch this amazing video to see orangutans in the wild.
Orangutan Family Tree
Orangutans belong to the family Hominidae, whose members are known as the ‘great apes’. There are five other species in the great ape family: eastern and western gorillas, chimpanzees, bonobos and humans. That’s right: you and I belong to the same animal family as the orangutans! In fact we share around 97% or our DNA with them!
(DNA is a chemical that instructs our bodies how to grow).
Both orangutan species are members of the genus Pongo. (A genus is a group of closely-related animals. Humans are in the genus Homo).
Confused by terms such as ‘genus’ and ‘family’? Check out our Animal Classification article.
What Do Orangutans Eat?
An orangutan’s favorite food is fruit. It eats a variety of different fruit, including jackfruit (the world’s largest fruit from a tree), and durians, which are famous for their strong, unpleasant smell.
Orangutans will also eat a variety of other plant matter, including leaves, bark and shoots. Their diet also includes insects and bird eggs.
Orangutan Family Life
Male and female orangutans generally only come together in order to mate. Females reach maturity earlier than males, and begin to produce offspring at around fourteen to fifteen years of age.
Mature males with facial flanges attract females by giving loud calls. Males without facial flanges usually have to approach females in order to mate. Females seek the protection of dominant males from unwanted advances by unflanged males.
In the absence of a dominant male, a non-dominant male will quickly assume the role, growing flanges and the other attributes of a dominant male.
Females are pregnant for 9 months. Infants are carried everywhere by their mothers for the first few months of their lives, and remain totally reliant on their mothers until they are around 2 years old. At this age their climbing skills are sufficiently developed to allow them to climb unaided. Males play no part in the rearing of their children.
Orangutan infants are only weaned at four to seven years of age. Orangutans are very slow to reproduce, with gaps of between 6.1 and 7.7 years between children for Bornean orangutans, and 8.2 to 9.3 years for Sumatran orangutans.
This means that it is incredibly difficult for orangutans to bounce back if large numbers are lost due to hunting, forest fires or deforestation.
The typical lifespan of an orangutan is between 30 and 45 years in the wild, and up to 60 years in captivity.
Why Are Orangutans Endangered?
Both the Bornean and Sumatran orangutan are critically endangered. According to IUCN estimates in 2016, there are only around 104,700 Bornean orangutans left in the wild, and even fewer (around 13,835) Sumatran orangutans.
The number of Bornean orangutans in the wild decreased by over 60% between 1950 and 2010, and a loss of a further 22% of the population is projected to have occurred by 2025. The Sumatran orangutan population is also in decline.
The primary reason for the decline in the populations of both species is habitat loss due to deforestation. Forests are cleared to make way for oil palm plantations and other industrially farmed crops. Logging for timber is another major cause of deforestation. Forest fires have also led to large areas of forest being lost.
Unbelievably, hunting is still a factor in the orangutan’s decline. Despite their critically endangered status, both species of orangutan are still being targeted by local hunters for their meat. It is thought that over 2,200 Bornean orangutans are killed every year by hunters.
How To Help Orangutans
There are several things you can do to help orangutans. Perhaps the most important is to stop buying products made with palm oil. Palm oil is found in a wide range of products, from snacks to cosmetics. If everyone stopped using palm oil products, the rate of deforestation would slow down dramatically almost overnight.
The second thing you can do to help orangutans is to spread the word! The more people who know how much trouble orangutans are in, the more likely something will be done to help. Why not make a poster, or give a presentation to your school?
Thirdly, you can either give or raise money for orangutan charities such as the Orangutan Project, or the Orangutan Foundation. These charities work at the forefront of orangutan conservation. By raising money for them, you’re directly helping orangutans. If you’ve got some time on your hands, you can even volunteer for them! Check out their websites for details.
Orangutan Facts Conclusion
Orangutans are awesome creatures. They’re very human-like in many ways and it doesn’t say much for our own species that most of the orangutan’s problems are down to us. Let’s help spread the word and turn around the orangutan’s decline!
- Discover more endangered animals here: Endangered Animals List
- Become an animal expert! Animals: The Ultimate Guide
- Learn about mammals: Mammals: The Ultimate Guide
- Find out all about rainforest animals: Rainforest Animals List
- Download rainforest worksheets: Active Wild Rainforest Worksheets