Oklahoma includes a wide variety of habitats supporting a large number of species. This book aims to provide an up-to-date summary of current knowledge of the life histories, ecologies, natural histories, distributions and literature of the Oklahoma mammals, of which nearly 20,000 specimens were examined by the authors in museums throughout the United States. The life history of each species recorded in Oklahoma summarizes aspects of reproduction, food habits, taxonomy, range, diagnostic differences between closely related species and records of occurrence. The accounts are arranged phyllogenetically, and all life-history information is arranged in the same sequence for easy reference. Range maps show the distributions of the species at a glance. The fully illustrated keys to species are designed for use at every level of knowledge.