The book "Epigenetic variability and general problems of studying the phenetic diversity of mammals" by Vasilyev A. G. It is a fascinating and in-depth study that opens new horizons in understanding mammalian biology. This work will be of interest not only to specialists in the field of biology and genetics, but also to a wide range of readers interested in the evolution, ecosystems and diversity of living organisms. Vasilyev A . G. in his book raises important questions regarding epigenetics, a science that studies hereditary changes that are not associated with changes in DNA sequence This trend is becoming increasingly relevant in light of current research showing how environmental factors can influence the genetic predisposition of organisms. The author examines in detail how epigenetic mechanisms affect the phenotic diversity of mammals, which in turn opens up new perspectives for understanding the adaptation and survival of species in changing environmental conditions. The book will be of particular interest to students and graduate students of biological faculties, as well as researchers working in the field of ecology and evolutionary biology. It will be a useful resource for those who want to deepen their knowledge of the mechanisms governing the variability of living organisms, and how these mechanisms can be used to solve practical problems related to nature conservation and biodiversity conservation. The topics covered in the book cover a wide range of issues, from the molecular underpinnings of epigenetic changes to their impact on population dynamics and ecosystem processes. Vasilyev A . G. not only analyzes existing research, but also offers new approaches to the study of phenetic diversity, which makes his work relevant and in demand in the scientific community. The book also addresses issues related to climate change and its impact on mammals, making it particularly relevant in the face of contemporary environmental challenges. The author's style is distinguished by clarity and accessibility, which allows even readers without deep knowledge in the field of genetics to understand complex concepts. Vasilyev A . G. He is known for his scientific publications and research in the field of ecology and genetics, and in this book he continues to develop his ideas, offering readers a fresh look at the study of biological diversity. If you are interested in topics such as evolution, genetics, ecology and biodiversity, then “Epigenetic variability and the general problems of studying the phenetic diversity of mammals” will be a real find for you. This book will not only expand your knowledge, but also inspire new research and discoveries in the field of biology. Do not miss the opportunity to immerse yourself in the world of epigenetics and learn how it shapes life on our planet.