This book is devoted to the description of the systematics and biology of forest mice and jerboas. It describes detailed morphological characteristics and includes keys for the identification of the families, genera and species. Detailed maps of distribution of species are compiled. Data on the biology is according to the set plan (population, habitat, feeding, daily and seasonal activity, behavior, reproduction, parasites and competitors, etc.). This book primarily focuses species found in Russia, Ukraine, Caucasus, Russian Central Asia and Transcaucasia. Brief coverage of species outside these regions is also included. The book is intended for mammalogists, systematists, ecologists, and zoogeographers.