• Finger snapping is one of the fastest movements of the body.
• The whites of the eyes (sclera) are unique among primates and aid communication.
• Skin is almost hairless compared with other primates.

The human body lacks a dense coat of hair: visible hair grows mainly on the head and, in adults, under the arms, in the groin and on the face in men. Skin colour ranges from very light to dark brown, hair from blond to black, and eyes from blue and grey to brown. The face is flat with a protruding nose and chin and a high forehead. The arms are noticeably shorter than the legs.