"This extraordinary book by Karasov and Martinez del Rio integrates a wealth of research about how animals select, consume, and process food. The authors treat topics ranging from energy budgets, food chemistry, the structure and function of digestive systems, postabsorptive nutrient processing, and chemical ecology to feeding behavior, growth, production, and reproduction...Accessibly written, with clear, informative graphs and line drawings."--P.E. Hertz, Choice "This is an excellent textbook for undergraduate--and graduate-level courses, and is recommended for researchers who are interested in an up-to-date overview of this field."--Raymond Barbehenn, Quarterly Review of Biology "A big topic demands a big book, with some big thinkers behind it. When I agreed to review this book, I knew, given the authors, that I would see some big thinking, but the size of their effort took me by surprise. Physiological Ecology (all 744 pages, 2.7 liters, and 1.9 kilograms of it!) is a comprehensive yet surprisingly accessible treatment of a topic that is the linchpin for biologists of many stripes... So if animals and food webs are central to your interests, you should read this book."--James J. Eiser, BioScience "The authors can be very proud of their accomplishments in this book because their text deals with the general problem 'how animals process energy, nutrients, and toxins' in a very detailed, balanced, clearly written, informatively illustrated--in short, in an excellent way! One does not have to be a prophet to state that this book is destined to become a classic; it will become a widespread, often consulted and continually cited source of reference."--Peter Langer, Mammalian Biology