Physiological ecology has grown in importance as an area of biology in the past thirty years and integrates the diverse approaches used in the comparative biology of organisms. Biologists segregate their approaches by technique and concept, but the boundaries among ecology, behavior, anatomy, and physiology are arbitrary and of no significance to organisms. Physiological ecology emphasizes the diversity of not only organisms, but also of solutions to (and evasions of) problems posed by the environment. In a comprehensive and authoritative synthesis of physiological ecology supported by more than 3,100 references, Brian K. McNab demonstrates the intellectual cohesion of the field. To ground his discussion in clearly understood contexts, McNab emphasizes the common thread of energy expenditure throughout the text and limits the discussion to vertebrates, which have familiar habitats and comparatively well-known evolutionary histories. A thorough scientific resource and reference tool, Physiological Ecology of Vertebrates is the first book to cover this complex subject. It will be the standard reference and basis for much future research in this fast-growing field of study.