The third edition is a complete revision of the most comprehensive textbook on conservation biology. Written by leading experts in the field, it is intended for use in conservation biology courses at the advanced undergraduate and graduate levels, as well as by researchers and practitioners. It assumes a basic background in biology and ecology. Guest essays and case studies provide a diversity of perspectives and real-world examples that add insight and provoke discussion. The third edition features a wholly revised organization, emphasizing both analyses of different categories of threat and approaches to conservation. The book is richly illustrated, and concludes with an extensive glossary of useful terms and a large bibliography that has proved a valuable reference for students and researchers.