The two species do not generally differ in body size. Adult female bonobos are slightly smaller than adult males. The male’s body length is 73-83 centimeters, and the female’s is 70-76 centimeters. The body weight of females ranges from 26-36 kilograms, and males from 36-43 kilograms.
The bonobo can be distinguished from the common chimpanzee by its more slender body, longer limbs, black face with light eyelids and a light chin, as well as black hair, thick and long sideburns, and reddish lips.
