RICHARD J. GREEN / SCIENCE PHOTO LIBRARY RICHARD J. GREEN / SCIENCE PHOTO LIBRARY
Orangutan (Pongo pygmaeus). Orangutans are primates found only on the islands of Sumatra and Borneo. The word orangutan derives from the Malay orang-hutan, which means man of the forest. They are unique among great apes (a group that includes gorillas, chimpanzees and bonobos) in that they are arboreal, the world's largest tree-dwelling mammals, with males weighing over 200 pounds. Orangutans are frugivorous and feed primarily on fruit. Orangutan babies weigh 3 or 4 pounds at birth, and like human infants, are extremely reliant on their mothers. Second only to humans, orangutans have the longest dependent childhood of any other animal.
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