This is an account of the world of birds, and this volume is 1st of 12. The introductory chapter is illustrated with detailed plates to complement the text, and deals with such diverse aspects as evolutionary history, anatomy, physiology, migration, and systematics. Each chapter covers a different family, headed by a summary box. Photographs illustrate more unusual features, such as courtship behaviour, thermoregulation or feeding techniques. Each chapter is subdivided into sections: systematics; morphological aspects; habitat; general habits; voice; food and feeding; breeding; movements; relationship with man; status and conservation; and a general bibliography. The species account lists names in French, German and Spanish, in addition to scientific and English names. Each species features: its own distribution map indicating resident, breeding and non-breeding ranges; its official status, according to BirdLife International; and the threats facing each species.