The importance of scent in animal behaviour is now recognized. In this two-volume set the editors have aimed to review current knowledge on animal olfactory communication, to present new information on the subject, and to provide a synthesis that emphasizes a wider socio-biological framework. An introductory chapter reviews sources of significant odours; the main part of the book is a series of chapters by specialist authors reviewing the mammalian orders from the monotremes to the primates.