This book provides an in-depth review and analysis of the biology of adults and larvae of the Family Oestridae (commonly known as botflies, or warble flies). Oestrid flies cause myiasis (invasion of living tissue by the larvae), and are a major pest of both domestic and wild animals worldwide. The book presents a comparative investigation of the life histories and adaptation to parasitism exhibited by this unique family of flies. It also gives a detailed survey of each genus and provides a synopsis of the taxonomy of the family. It contains chapters on morphology, life history, host-parasite relationships, taxonomy and behaviour.