"e;Vividly narrated and illustrated"e; this analysis of how endothermy evolved in birds and mammals is "e;provocative and fascinating"e; (Southeastern Naturalist). This pioneering work investigates why endothermy, or "e;warm-bloodedness,"e; evolved in birds and mammals, despite its enormous energetic costs. Arguing that single-cause hypotheses to explain the origins of endothermy have stalled research since the 1970s, Barry Gordon Lovegrove advances a novel conceptual framework that considers multiple potential causes and integrates data from the southern as well as the northern hemisphere. Drawing on paleontological data; research on extant species in places like the Karoo, Namaqualand, Madagascar, and Borneo; and novel physiological models, Lovegrove builds a compelling new explanation for the evolution of endothermy. Vividly narrated and illustrated, this book stages a groundbreaking argument that should prove provocative and fascinating for specialists and lay readers alike. "e;A lovely synthesis. . . . A particular value of this book is the unification of the paleontological and comparative physiology literatures. I loved the images of reconstructed ancestral vertebrates; these bring the bones to life, and helped me reimagine our endothermic ancestors."e; Jon Harrison, Quarterly Review of Biology"e;In my view Barry Gordon Lovegrove is probably the best person alive to tackle this subject in the round."e; Andrew Clarke, Emeritus Fellow, British Antarctic Survey, author of Principles of Thermal Ecology"e;Barry Lovegrove has a history of tackling key macroevolutionary questions from the perspective of evolutionary physiology. [A] must-read."e; Theodore Garland, Jr., University of California, Riverside"e;The evolutionary journey of endothermy in vertebrates: a lot older and hotter than you think."e; Fritz Geiser, University of New England

A groundbreaking argument on how endothermy-arguably the most important innovation in vertebrate evolution-developed in birds and mammals "Vividly narrated and illustrated. . . . Provocative and fascinating for specialists and lay readers alike."-Southeastern Naturalist This pioneering work investigates why endothermy, or "warm-bloodedness," evolved in birds and mammals, despite its enormous energetic costs. Arguing that single-cause hypotheses to explain the origins of endothermy have stalled research since the 1970s, Barry Gordon Lovegrove advances a novel conceptual framework that considers multiple potential causes and integrates data from the southern as well as the northern hemisphere. Drawing on paleontological data; research on extant species in places like the Karoo, Namaqualand, Madagascar, and Borneo; and novel physiological models, Lovegrove builds a compelling new explanation for the evolution of endothermy. Vividly narrated and illustrated, this book stages a groundbreaking argument that should prove provocative and fascinating for specialists and lay readers alike.