Chimpanzees, clearly, understand and may respond appropriately to many of the postures, gestures and calls of the baboon communication system – signals given in friendliness and threat, submission and sex. Equally, the baboons understand similar messages conveyed by the chimpanzees. Individuals of each species are alerted by the alarm calls of the other – indeed, they pay attention also to the alarm calls of various kinds of monkeys and even birds.
