For one, bonobos are small and slender when compared to the taller, stockier chimps. Also bonobos have pink lips and black faces, while chimps have brown lips and faces that change color as they age. Another notable distinction is the bonobo’s longer head hair, which tends to part stylishly down the middle.
The common chimpanzee (Pan troglodytes), also known as the robust chimpanzee, is a species of great ape. The common chimpanzee is usually called the chimpanzee (or "chimp"), though this term can be used to refer to both species in the genus Pan: the common chimpanzee and the closely related bonobo, formerly called the pygmy chimpanzee.