Mountain Sheep in North America: Biology, Ecology, Conservation, and Management provides a detailed account of bighorn and thinhorn sheep across their geographic ranges from Alaska and Canada to Mexico. This book examines all aspects of the sheep life history including activity patterns; biology; conservation; diet; ecology; genetics; habitat requirements; health and disease; historical perspectives; management approaches; predation; competition with other species; natural history; social behavior; taxonomy; the changing role of agency, Indigenous, and conservation stakeholders; and the considerations for future management actions, opportunities, and conservation risks. The book describes advancements in new technologies supported by current science, disproving some long-held assumptions about the species and their ecology, making it the most comprehensive source of information about mountain sheep in North America today. It offers the reader a better understanding of the management of mountain sheep, and the numerous challenges of a developing world including anthropogenic influences, altered habitats, species assemblages, and changing climates. Each chapter is written by internationally recognized experts and practicing mountain sheep managers from agencies and academia. New research is presented within broader shifts in conservation policy and funding, helping readers understand the practical implications of evolving science in real-world situations and offering wisdom that will help them create positive conservation outcomes for mountain sheep. This is an essential text for students of wildlife, early-career and experienced biologists, managers, policy- and decision-makers, administrators, and anyone interested in mountain sheep in our world today, including those who are simply passionate about them. This book will provide even the most knowledgeable mountain sheep enthusiast with an improved understanding of this magnificent wildlife resource.