Primates are avid explorers that utilize a variety of sensory clues from the environment. The special senses of olfaction, audition, and particu- larly vision are thus of paramount significance in the evolution and adaptive radiation of the primates. It was with this in mind that this volume was planned to present some recent research advances. The chapter on olfactory communication among primates affords new insights concerning a sense which, though primatologists have generally relegated it to a minor role, is of considerable significance in the primates. The chapters on the auditory system...