In the first book, "The World of Animals," Igor Akimushkin explores seven orders of mammals: monotremes, marsupials, insectivores, bats, carnivores, odd-toed ungulates, and even-toed ungulates. Why were only marsupials and egg-laying animals found in Australia before humans arrived? Who reigns supreme: the lion, the tiger, or the bear? Delve into the mysteries behind the spines of hedgehogs. Akimushkin invites readers on an exciting journey into the animal kingdom. This book offers a captivating look at the world of mammals, weaving a central theme throughout: humanity's responsibility for the fate of the animals on our planet. Igor Ivanovich Akimushkin's works are not dry monographs or merely scientific overviews of systematic groups in the style of classic publications; they are engaging reads. The core of his writing consists of stories about animal behavior. While morphology and systematics receive little attention, the focus on animal behavior and zoopsychology is substantial. Special thanks to user Alexeew for providing the scans that made this book in djvu format possible. Discover more of Igor Ivanovich Akimushkin's works on the website: From Evening to Morning, The Tragedy of Wild Animals, Once Upon a Time There Was a Beaver, It's All About Cats, Who Flies Without Wings, WHERE? and HOW? Nature's Oddities, First Settlers of the Land, The World of Animals, Vol. 2, The World of Animals, Vol. 3, The World of Animals, Vol. 4, The World of Animals, Vol. 5, The World of Animals, Vol. 6, Sea Primates, Tracks of Unseen Beasts, and The Path of Legends.