A completely revised and updated edition of the leading mammalogy textbook, featuring color photographs throughout and a new streamlined structure for enhanced use in courses. There are more than 6,400 species in the class Mammalia, including the blue whale—the largest animal that has ever lived—and the pygmy shrew, which weighs little more than a dime. Such diversity among mammals has allowed them to play critical roles in every ecosystem, whether marine, freshwater, alpine, tundra, forest, or desert. Reflecting the expertise and perspective of five leading mammalogists, the fifth edition of Mammalogy: Adaptation, Diversity, Ecology significantly updates taxonomy, adds a new introductory chapter on the science of mammalogy, and highlights several recently described species. To enhance its appeal to students, textual material has been reduced, consolidated, and streamlined without sacrificing breadth or depth of coverage. The fifth edition includes• for the first time, stunning color photographs throughout• chapters rearranged and grouped to best reflect phylogenetic relationships, with updated numbers of genera and species for each family• updated mammalian structural and functional adaptations, as well as ordinal fossil histories• recent advances in mammalian phylogeny, biogeography, social behavior, and ecology, with 12 new or revised cladograms reflecting current research findings• new breakout boxes on novel or unique aspects of mammals • new work on female post-copulatory mate choice, cooperative behaviors, group defense, and the role of the vomeronasal system• discussions of the current implications of climate change and other anthropogenic factors for mammalsMaintaining the accessible, readable style for which Feldhamer and his coauthors are well known, this new edition of Mammalogy is the authoritative textbook on this amazingly diverse class of vertebrates.