This book describes in detail the work of a large number of students and senior researchers on the wild chimpanzees of the Budongo Forest Reserve in Western Uganda. Vernon Reynolds presents a coherent and in-depth account of one chimpanzee community of more than 60 individuals, living in the Sonso area in the middle of the Budongo Forest, which he and his colleagues have studied intensively over the last 15 years. He describes their forest habitat, their diet and culture, their social organisation and behaviour, their diseases, and the threats to them that derive from the actions of people in the surrounding villages. The book combines new and often unpublished studies with past publications, and also compares the Budongo chimpanzees with wild chimpanzees studied at other sites across Africa. The result is the most comprehensive account of the Budongo chimpanzees ever published, with a wealth of referenced material that will serve as a source of information for many years to come.