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;...