Bornean orangutans are sexually dimorphic. Females range from 30 to 50 kg, whereas males are from 50 to 90 kg. Head and body length is about 1.5 meters and the arms have a spread of about 2.2 meters. They have a thin, shaggy coat that is reddish brown in color. Males have large cheek pads, which are made up of deposits of subcutaneous fat bound by connective tissue. These cheek pads continue growing for much of an adult male's life. Orangutans have a high, sloping forehead and a bulging snout. They have short, weak legs, but strong hands and arms.
Other Physical Features: Endothermic; Homoiothermic; Bilateral symmetry
Sexual Dimorphism: Male larger