Orangutans display significant sexual dimorphism; females typically stand tall and weigh around , while flanged adult males stand tall and weigh . Compared to humans, they have proportionally long arms, a male orangutan having an arm span of about , and short legs. Most of their bodies are covered in coarse hair that is generally red but ranges from bright orange to maroon or dark chocolate, while the skin is grey-black. Though largely hairless, males' faces can develop some hair, giving them a beard.