This book is a short but vivid story about the first completely land insects, with reflections on the paths of their evolution and on the environment-forming activities of animals, constantly recreating the biosphere. It is the fruit of the author’s long-term observations in nature, careful study of scientific literature, as well as lecturing. The book expands the horizons of the school curriculum in a fascinating way and makes the comprehension of the relevant chapters of zoology and ecology more meaningful. In terms of its form, it can be classified as a special genre of scientific and artistic literature.