Book "Ecoparasites . Fauna, biology and practical significance. Issue. 4. The team of authors presents a unique and comprehensive study of the world of external parasites, which, despite their small size, have a huge impact on human, animal and ecosystem health in general. This scientific work is intended for specialists in veterinary medicine, medicine, biology, as well as for students and anyone interested in parasitology and ecology. It reveals in detail the features of the fauna of ectoparasites, their biological features, mechanisms of interaction with their owners and their role in natural and anthropogenic conditions. Issue 4 of the series is devoted to the latest achievements in the study of external parasites, their diversity and practical significance. The authors, combined into a team of experts, offer the reader a fresh perspective on the problem, based on the rich experience of field research and laboratory experiments. The book examines in detail such groups of parasites as fleas, lice, ticks, midges and other representatives of the fauna that cause diseases in pets, wild animals and humans. Special attention is paid to their biology, life cycles, adaptations, and coping techniques, making the book a valuable guide for practicing veterinarians, zootechnicians, and health prevention specialists. This book is not only a scientific work, but also a practical manual that describes modern methods of diagnosis, prevention and control of ectoparasites. The authors share current data on new species of parasites, their distribution and threats associated with climate change and globalization. An important part of the work is the analysis of the practical aspects of the fight against parasites, which makes the book indispensable for those who are engaged in the protection of animal and human health. In addition, it raises issues of ecological balance and the need for a careful approach to nature when using chemical and biological methods of control. The style of presentation is distinguished by scientific accuracy and accessibility, which makes it possible to make complex biological and parasitological concepts understandable to a wide audience. The author’s team uses a rich illustrative material, diagrams and tables, which contributes to a deeper understanding of the material. The book also presents comparative analyses, modern research and promising directions for the development of parasitology, which makes it relevant for both researchers and practitioners. If you are interested in parasitology, control of external parasites, veterinary medicine or ecology, "Ectoparasites. Fauna, biology and practical significance. Issue. 4. It will be a valuable source of knowledge and practical advice for you. This book is perfect for those who want to expand their knowledge of parasites, understand their role in nature and learn how to effectively deal with them in real conditions. It will also be of interest to students, graduate students and faculty looking for up-to-date and verified information on the topic. The author's team, united by rich experience and scientific competence, created a work that deservedly occupies an important place in modern parasitology. "Ectoparasites. Fauna, biology and practical significance. Issue. 4. It is not just a collection of facts, but an in-depth study that reveals the complex and multifaceted world of external parasites, their interaction with the environment and people. This book is an indispensable helper for all who seek to understand the nature of parasitism and find effective ways to combat it, preserving health and balance in nature and in human society.