Book "Fauna of the USSR . Mammals. T. 3, vol. 2: Land squirrels (Marmotinae)" by E. M. Thunder is a unique work that immerses the reader in the world of mammals, namely in a fascinating and diverse genus of squirrels. This publication is part of an extensive series devoted to the fauna of the Soviet Union, and aims to study and systematize species belonging to the subfamily Marmotinae. The book will be of interest not only to specialists in the field of zoology and biology, but also to a wide range of readers interested in nature and its inhabitants. Students, graduate students, teachers, as well as lovers of nature and ecology will find in this publication a lot of useful information. The age category of readers is not limited, since the book is written in accessible language, which makes it easy to perceive even complex scientific concepts. In this volume, the author explores many aspects of the life of land squirrels, from their morphology and ecology to behavior and reproduction. Gromov shares the results of his long-term observations and research, which gives the book special value. The reader will be able to learn about the different species, their habitats, and how they have adapted to different conditions. This work not only enriches knowledge about fauna, but also raises important questions about the conservation of biodiversity and ecosystems. Gromov’s style is distinguished by scientific accuracy and depth of analysis, which makes his work fundamental in the field of zoology. He is already known to readers through his other works, such as "Fauna of the USSR. Mammals. T. 1" and "Fauna of the USSR. Mammals. T. 2", which were also praised for their contributions to mammal studies. In this volume, he continues his work, delving into the specifics of land squirrels, making his work indispensable for anyone interested in this topic. The book raises important topics such as human impact on squirrel habitat, climate change, and their implications for ecosystems. Gromov emphasizes the need to protect these animals and their habitats, which makes his work relevant in the light of modern environmental problems. Readers will be able not only to expand their knowledge of squirrels, but also to think about how their actions affect nature. Edition "Fauna of the USSR. Mammals. T. 3, vol. 2: Land squirrels (Marmotinae)” will be a real find for everyone who wants to understand the world of mammals and their importance in the ecosystem . This is not just a book, but a whole world full of discoveries and knowledge, which is waiting for its reader. If you are looking for information about squirrels, their behavior, ecology and conservation, then this publication will become your reliable companion in this fascinating journey.