The book Pleistocene Shrew Bags from San Josecito Cave, Nuevo León, Mexico by Russell Robert J. is a study of the archaeological finds discovered at San Josecito Cave in Nuevo León, Mexico. The book appeals to a wide range of readers interested in paleontology and archaeology, revealing important aspects of the history and evolution of the local fauna during the Pleistocene epoch. The author highlights the importance of studying small mammals, such as shrews, in reconstructing ancient ecosystems and determining past climate changes. Thanks to the accessible speech and detailed description of the materials, the book will be a useful addition to the library of anyone interested in studying the ancient history of the Earth.