The book "The determinant of mammals of the Mongolian People's Republic" by A. G. Bannikova is a unique publication that will become an indispensable assistant for both professional biologists and nature lovers who want to better understand the diversity of the fauna of Mongolia. In this work, the author invites readers to plunge into the amazing world of mammals living in the territory of this mysterious country, known for its endless steppes, mountains and unique ecosystems. A. G. Bannikov, an outstanding zoologist and author of many scientific papers, masterfully combines a scientific approach with accessible language in his book, which makes the material understandable even for those who do not have deep knowledge in the field of biology. It offers the reader not just a list of species, but a whole story about each of them: their habits, habitat, behaviors and interactions with the environment. This makes the book not only a reference book, but also a fascinating read for anyone interested in nature. The book will be especially interesting for students of biological faculties, ecologists, ornithologists, as well as all those who are planning a trip to Mongolia or just want to expand their knowledge of mammals. It is suitable for both adults and adolescents who are passionate about studying nature and want to learn more about animal life in the wild. The topics raised in the Mammalian Definition cover not only the systematics and classification of species, but also important environmental issues. A. G. Bannikov focuses on the threats faced by mammals as a result of human activity, climate change and loss of natural habitat. It encourages readers to reflect on the importance of biodiversity conservation and the need to protect rare and endangered species. The author's style is distinguished by scientific accuracy and at the same time vivid presentation. He skillfully uses vivid examples and fascinating facts, which makes reading not only informative, but also fascinating. In the book there are illustrations that help to better understand the described species and their features. This is especially important for visual readers who perceive information through images. Except for the mammalian determinant, A. G. Bannikov is known for his other works on the fauna of different regions, which confirms his status as an expert in the field of zoology. His research and publications have become the basis for many scientific works and projects on nature conservation, which makes his contribution to science invaluable. If you are looking for a book that will not only enrich your knowledge of the mammals of Mongolia, but also inspire you to protect nature, the “Mongolian People’s Republic Mammal Definer” will be an excellent choice. This book is not just a reference book, but a real encyclopedia that will open doors for you to a world of wildlife full of secrets and wonders. By diving into its pages, you will not only learn about the life of animals, but also feel the importance of preserving them for future generations.