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Orangutans are unique in many ways. They are the only Great Ape in Southeast Asia, and the only Great Ape (other than humans) found outside Africa. They are the only 'red' ape, and the only strictly arboreal ape, meaning that they spend their lives in the forest canopy, even building nests in the trees in which to sleep. The other Great Apes (chimpanzees, bonobos and gorillas) do climb and build nests in the trees, but tend to spend their lives on the ground.