Recent ideas and experimental studies suggest that the relationship between parasitism and host behaviour has been a powerful shaping force in the evolution not only of behaviour patterns themselves but, through them, of morphology and population and community dynamics. This book brings together recent work across the disciplines of parasitology and animal behaviour which is revealing the fundamental role of parasitism in the evolution of behaviour. The aim is to look broadly at the relationship between parasitism and behaviour from pathology and epidemiology to strategies of exploitation and counter exploitation. In doing so the book will traverse the phylogenetic scale from enteric protozoa and nematodes to colouration and courtship of birds and human cultural traditions.