"Orangutan" means "person of the forest" in the Malay language. They share approximately 97 percent of the same DNA as humans.

As the largest tree-dwelling or "arboreal" mammals on Earth, orangutans have impressive arm spans. A male orangutan can stretch his arms up to seven feet wide from fingertip to fingertip!


Scientific Name: Pongo pygmaeus

Conservation Status: Critically Endangered

Size: Standing height of 4 to 5 ft.

Weight: Males range from 220 to 240 lbs. and females range from 120 to 130lbs.

Median Life Expectancy: Males:27.8; Females:37.6

Bornean orangutan sitting
Nutrition
Orangutans mainly eat fruits, leaves, bark, flowers, and insects. The fruit in the wild is nutritionally similar to vegetables; wild fruits are much lower in sugar than what we have in the US. They spend a lot of time moving through the trees to find food. Sometimes, they can easily find high-calorie foods that let them eat as much as they want without traveling far. However, most of the time, the food they find is lower in calories, so they have to travel farther to get enough to meet their nutritional needs.

At the Zoo, orangutans are offered specially formulated leaf-eater biscuits, leafy greens, and a variety of fruits and vegetables.
Pomegranates are a favorite fruit. They also love carrots and peas. They will spend an exceptional amount of time trying to find and eat all of the peas first. Browse is a favorite as they turn the branches into tools to access other food items. They enjoy stripping bark in long strands, leaving the browse “naked.” If it is a soft/young branch, they will also work at getting to the pith in the middle. They thoroughly enjoy honey locust and mulberry leaves, and browse acts as a natural toothbrush for this (and many other) species.

Orangutans will create what is known as a “wadge,” where they take food and place it inside their lower lip so they can suck on it for an extended period (before discarding it when they are done). This process can help them extract extra nutrients from particularly fibrous food that may be challenging to swallow and/or to extend the enjoyment of their favorite foods. At the Zoo, they use carrots, broccoli, apples, pears, and peas to create their wadge (sometimes incorporating wood wool, paper, or cardboard to help it compact). Dumplin especially likes to make wadges with her alfalfa. Similarly, Sulango uses long arm hair with citrus peels, while Khali has been known to use sheets for this activity.
Current Range and Historic Range
Bornean Orangutans live on the island of Borneo in areas governed by Malaysia and Indonesia.
Habitat
Bornean orangutans are found more often in low forests than in higher areas. They like areas that flood and peat swamps because these places grow more fruit for them to eat. Since orangutans live most of their lives high up in trees, they depend on these thick and rich forests to survive.
Predators and Threats
The only predator of Bornean orangutans is humans.

Since these orangutans spend most of their lives in trees, their populations are greatly affected by habitat destruction caused by palm oil plantations, farming, and logging. Forest fires, which often happen during land-clearing, can destroy large areas of forest. As their habitat shrinks, orangutans are forced into smaller, fragmented areas.
In addition to habitat loss, Bornean orangutans also face dangers from hunting for their meat and the illegal capture of baby orangutans to sell as pets.
Physical Description and Adaptations
Bornean orangutans are known for their orange-red hair and long arms, which help them move through the forest canopy. Unlike many other primates, they do not swing from branch to branch because of their larger size. Instead, they move more slowly and carefully, using both their hands and feet to grasp tree limbs. Their long hair and coloring help them camouflage in the tree tops.

One unique feature of Bornean orangutans is that they have two different forms of mature males, known as "bimaturism." Some males develop large cheek pads called "flanges," while others remain "unflanged." Flanged males can be twice the size of females and have a long coat of dark hair, a facial disk with flanges, and a throat sac that they use to make loud calls. These males usually have a well-defined territory that includes the areas where several females live and with whom they mate.

On the other hand, unflanged males are the same size as adult females. They do not have the unique characteristics of flanged males, do not make long calls, and are generally more tolerant of one another. Both types of males can have offspring. The change from unflanged to flanged male happens sometimes and is influenced by social interactions that are still not completely understood.
Reproduction
Dominant orangutan males usually have a well-defined territory that includes the areas where several females live. Younger males often cannot sustain a range of their own and wander throughout the forests, mating with females when they can. Female animals typically give birth to one baby after about 245 days of being pregnant. They become mature between the ages of 10 and 15 and usually have babies every seven to nine years.

The connection between mothers and their babies is very strong. Infants cling to their mother's fur and ride on her back. They are weaned around the age of three and can stay with their mothers until their early teens. During this time, they learn the skills needed to survive on their own. Young females usually stay close to their mothers, while young males wander the forest until they establish their own territories.
All orangutans in professional care in North America are monitored by the SSP (Species Survival Plan) which tracks their genetics. There are currently 52 male and 63 female Bornean Orangutans living in the AZA SSP population, according to Zims (the AZA database).
Communication
Orangutans have special throat pouches that let them make deep, echoing sounds in the forest. As male orangutans move around, they create different rumbling and howling calls to avoid running into each other. One of their main sounds is called the "long call." This call lasts one to two minutes and is only made by flanged males; it can be heard from over a mile away. When they are upset, orangutans use sounds like kiss-squeaks and belching. They also use facial expressions and body language to communicate their feelings.
Behaviors
Orangutans are considered semi-social, which means they often like to be alone compared to other great apes. While male and female ranges can overlap, it's uncommon to see male orangutans together.

These animals are great at moving through the treetops, but their way of moving looks different from that of other tree-dwelling apes because they are larger. Orangutans are also very skilled at building nests for resting. These nests provide a cozy place to sleep at night and are made from materials they find in their surroundings, like leafy branches.

Orangutans have been seen using tools to help with everyday tasks, and mothers pass these skills on to their young. For instance, they use sticks to get termites and honey, and they use large leaves as umbrellas when it rains.
Everyday Actions
Because so much of their life is spent in the trees, habitat destruction caused by illegal oil palm plantations and logging has a significant impact on orangutan populations. Palm oil can be found in many products, from cosmetics to food. There is good news, though: Palm oil can be farmed sustainably!

One important way that people can help orangutans is to purchase items made from sustainably sourced palm oil. Sustainable palm oil production follows environmental standards to help keep the orangutans’ forest habitat healthy. Downloading and using the PalmOil Scan app (available in Google Play or the App Store) helps to identify which companies use sustainable palm oil and support protecting wildlife, and shows which products are orangutan-friendly.

Adopt a Bornean Orangutan

Orangutan Keeper Talk

Name
Sulango
Gender
Male
Year Born
1993
Weight
~230 lbs.
Identification Notes

Sulongo has flanges, which distinguish him from the females.

Additional Information
He enjoys training and being challenged by his keepers. Moved to Columbus from Zoo Atlanta where he sired 3 offspring. He is the father of Clementine.
Name
Dumplin
Gender
Female
Year Born
1974
Weight
~156 lbs.
Identification Notes

Her coloring is a lighter orange than Khali.

Additional Information
Dumplin is one of the oldest Bornean females in NA. She has never produced offspring, though she enjoys interacting with Clementine. Moved to Columbus in 2013 from a zoo in Jackson, Mississippi.
Name
Khali
Gender
Female
Year Born
2006
Weight
~148 lbs.
Additional Information
Pronounced 'Cah-lee," meaning 'free spirit.' She loves water, the splash pad, and spraying her face with water from the lixit. She also likes to put a stick in the lixit to keep it going. She enjoys covering herself with sheets/burlap. Moved to Columbus from Toledo in 2018. offspring of Boomer and Kutai. She is the mother of Clementine.
Name
Clementine
Gender
Female
Year Born
2023
Additional Information
Clementine is still very dependent on Khali and will be for 7 to 8 years. She enjoys walking around on her own, usually heading towards Dumplin. She was born at the Columbus Zoo to Khali and Sulongo. She is the First Orangutan born in Columbus in 60 years.