![]() Orangutans eat primarily fruit and play an important role dispersing seeds through defecation. Generally, Sumatran orangutans are lighter in color, have longer body hair and less pendulous throat sacs than Bornean orangutans, but the only reliable way to tell the difference between Sumatran and Bornean orangutans is by looking at their chromosomes. It can be difficult to tell Sumatran and Bornean orangutans apart. Orangutans also come down if there is a need to find food and water elsewhere, for example, if there is a drought or fire. When on the ground, they use all four limbs, supporting themselves on the sides of clenched fists, or occasionally walk on upright on two legs. Orangutans sometimes travel on the ground when going long distances because appropriate sized branches may not always be available. Orangutans' hands make them graceful and swift while swinging, but it makes walking on the ground very slow and awkward. This allows them to distribute their weight among the branches. Orangutans can brachiate -swing hand over hand -but they normally move cautiously through large trees by climbing and walking. ![]() Adult males have deep chests and much longer body hair than females do. Males also typically develop large cheek pads, which demonstrate genetic fitness and amplify their long calls. ![]() Males and females have flabby throat sacs, which become very large in adult males. You can typically tell male and female orangutans apart by looking at them. They have distinctive fingerprints and no visible external tails. They have grasping hands and feet with long curved fingers and toes. Orangutans are the largest arboreal mammals and are very well adapted to life in the trees, with arms much longer than their legs. They have large jaws and flattened noses in concave faces. Orangutans have long, sparse orange or reddish hair unequally distributed over their bodies.
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