In a social context, body odours act as effective psycho-biological signals modulating interpersonal interactions, but also as several physiological processes. This new book presents current research in the study of the biology, sources, olfaction and response to odours. Topics discussed include the biology of insect odours, the psychophysical, neurophysiological and neurobiological investigation of olfactory processes in humans, odours in the context of animal navigation and environmental odourants and irritants and their health consequences.