In this book, the eminent Cambridge zoologist Arik Kershenbaum invites the reader to imagine alien life. However, in his fantasies, the scientist relies on Darwin’s theory of evolution, observations of all forms of life on Earth, and most importantly, on universal physical and biological laws applicable to the entire Universe. The author explains what properties aliens must have, how they can move, interact and communicate with each other. Could they, by analogy with terrestrial fish, develop electrical communication? Is it possible to have planets on which animals move at supersonic speeds? Or worlds whose inhabitants speak the language of smells? Is cooperation between them and the development of technology inevitable? In a fascinating and accessible form, “A Zoologist's Guide to the Galaxy” introduces us to the latest scientific data about how all life on Earth and throughout the Universe actually works.