Explores the ways in which man and nature have used water, wind, weather, and wings to spread plants and animals around the world with good and bad results.
A.M. Hopf, or Alice Martha Lightner Hopf, is the author of more than nineteen books for young readers, among them science fiction novels. Her books include The Day of the Drones, Doctor to the Galaxy, and The Rock of Three Planets (published under the name A.M. Lightner). She also had a strong interest in natural history and entomology and has written several non-fiction children's books on the subject.