"Parasites" is a popular science book written with great erudition and deep understanding by author-biologist Karl Zimmer. This book covers a wide variety of parasites, from microscopic viruses to impressively complex worms. The author explains how parasites affect living organisms, their impact on the ecosystem and evolution. The book not only reviews the biological aspects of parasitism, but also raises ethical issues related to the use of parasites in medicine and research. "Parasites" will be an interesting source of knowledge for everyone who is interested in biology, ecology and medicine, as well as for those who want to deepen their understanding of the interaction of living organisms in nature.