This book presents data from a long-term study of African wild dogs (Lycaon pictus) in the Selous Game Reserve of southern Tanzania. While most the data is previously unpublished, the book also makes a serious effort to compile information from other studies of wild dogs, and studies of other social carnivores. African wild dogs are endangered, and much of the book focuses on identifying the ecological and demographic reasons that wild dogs are invariably rare in comparison to other large carnivores in the same ecosystems. The book presents substantial data on basic subjects such as ranging patterns, habitat selection, and life history. Wild dogs are obligately cooperative breeders, and the book examines a broad range of topics in the evolution and mechanisms of cooperation and conflict. Wild dogs are strongly affected by interspecific competition, which is examined at length. Finally, the book presents the largest data set collected to date on mammalian predator-prey interactions. While the book is written for professional biologists and students, it will also be of interest to well-read amateurs.