The author, a research biologist for the US Fish & Wildlife Service, has been studying wolves for over 30 years - work which has already produced over 200 articles and four books (including the classic The Wolf and The Arctic Wolf). This new book focuses on wolf behaviour and biology, offering an overview of social hierarchy, communication methods, feeding habits, courtship and reproduction. Mech highlights the latest research on wolf packs in the northern US states and the High Arctic, and notes the progress of wolf reintroduction to Yellowstone National Park.