This book is a continuation of the series of monographs on different orders of mammals. This volume is devoted to the description of the order Lagomorpha, which is represented by two extant families Leporidae and Ochotonidae. All descriptions of groups and species are given according to the scheme followed in the preceding volumes of the series. Palaeontological data on recent species and genera are briefly mentioned. The book is aimed at mammalogists, ecologists, zoogeographers and game specialists. In this book unpublished data on the biology and distribution of pikas has been published. Illustrations 58, table 57, bibliography of 13 papers.