Oklahoma is currently home to 117 known species of mammals, representing eight  mammalian orders—one marsupial (opossums; Didelphimorphia), seven insectivores (shrews and moles; Soricomorpha), twenty-three bats (Chiroptera), one armadillo (Cingulata), four rabbits (Lagomorpha), fifty-one rodents (Rodentia), twenty-two carnivores (Carnivora), and eight artiodactyls (deer, pronghorn, sheep, and bison; Artiodactyla). For the professional mammalogist and amateur naturalist alike, Mammals of Oklahoma provides a clear, comprehensive, illustrated guide to Oklahoma’s diverse native fauna, as well as introduced species and extirpated and unverified mammals cited in the state’s records. Incorporating the latest data, this second edition includes up-to-date descriptions and identification keys; line drawings and full-color photos and distribution maps; life history information; and ecological notes on such things as dens, nests, burrows, food habits, reproduction, pathogens and parasites, and predators. The book’s etymology offers insight into each species’ scientific name, and its natural history describes habitat and diseases, among other distinguishing characteristics. A glossary provides guidance on technical terms. This accessible and authoritative volume marks a significant update and expansion of the knowledge of mammals in Oklahoma. It will be the definitive desk reference and field guide to the state’s rich mammalian diversity.