Describes over 500 animals and plants worldwide that are threatened with extinction. Divided into eight sections, it covers mammals, birds, reptiles, amphibians, fish, molluscs, annelids, coelenterates, invertebrates and plants. Within each section the species are arranged taxonomically by family and genus. Each entry contains the following information: common and scientific name, classification, range, description and biology, habitat and current distribution, and history and conservation measures.