The first book, "The World of Animals", tells about seven orders of mammals: cloaca, marsupial, insectivorous, woolwings, predatory, odd-nosed and even-nosed. Why did Australia before the arrival of man inhabited only marsupials and egg-laying animals? Who is stronger: a lion, a tiger or a bear? Secrets behind the needles - about the incomprehensible habits of hedgehogs. Igor Akimushkin invites readers to make a fascinating journey to the animal kingdom with him In this book, the author talks about the world of mammals. The red thread through the entire book is the topic of human responsibility for the fate of the animals of our planet. Igor Ivanovich Akimushkin wrote books about animals and this is not a monograph, and not even a popular scientific review of systematic groups of the animal kingdom in the spirit of classical publications, but books for reading. Their main content is stories about the behavior of animals .. Morphology and systematics are given little space, and animal behavior and zoopsychology are given a lot of space. The author's other books on the site: It's all cats Traces of unseen animals