The book in a popular form tells about all representatives of the class of mammals, gives their characteristic characteristics, provides information about habitats, nutrition and reproduction, about the dangers or benefits that they bring. The book is well illustrated. It has colored "portraits" of all representatives of our mammals. In addition, 62 bar patterns given in the text will help determine which animal belongs to which paw prints, as well as get acquainted with the types of nests belonging to different birds.