Our ideas about aliens as an unusual form of life are often based on flashy Hollywood films and fantastic stories. However, biological laws that operate on our planet work in every corner of the universe. Drawing on her professional knowledge, observations of animals, and Darwin’s theory of evolution, zoologist Arik Kershenbaum explains which traits common among Earth’s inhabitants could also belong to forms of alien life. The author provides a long list of literature for those who want to go deeper into these topics.