Birds are hosts to any parasites, internal and external. The parasites inevitably form a burden to the host bird and therefore may affect its ability to grow, survive and reproduce, its behaviour, and the abundance and distribution of the whole species. In consequence, bird-parasite systems have attracted attention from diverse fields, and the literature has been spread out in a wide range of specialized journals. The editors of this book have drawn together a comprehensive range of experts in the field to provide an invaluable reference of current work in bird-parasite interactions. The book is divided into four parts. The introduction provides the contemporary context of research in bird-parasite systems, and the following parts provide case studies which combine theoretical concepts with evidence from the literature and experimental data. Part 2, Ecology, examines the effects of parasites on individual fitness and population responses. Part 3 deals with behavourial responses to parasitism. The final part, sexual selection, pays particular attention to the significance of Hamilton and Zuk's predictions about the role of parasitism in choice and body ornamentation which have recen