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Orangutans display significant sexual dimorphism; females typically stand 115 cm tall and weigh around 37 kg, while adult males stand 137 cm tall and weigh 75 kg. The tallest orangutan recorded was a 180 cm. Compared to humans, they have proportionally long arms, a male orangutan having an arm span of about 2 m, and short legs. They are covered in long reddish hair that starts out bright orange and darkens to maroon or chocolate with age, while the skin is grey-black.

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