What makes mammals mammals? How are they different from fish or insects? Join animal characters as they ask their neighbors questions about who they are. By the end of each narrative story, the main characters have learned the defining characteristics of their animal class. Translated into North American Spanish, humor draws elementary-aged readers into this illustrated life science lesson about animal diversity and classification. When curious Sigmund the salamander hears Francine the fly warning her friends not to fly near amphibians, Sigmund sets out on a mission to find out what exactly an amphibian is. After interviewing other animals and learning about the characteristics of amphibians, Sigmund realizes that he too is an amphibian! Translated into North American Spanish, the humorous narrative and dialogue will draw elementary-aged readers into this brightly illustrated life science lesson about animal diversity and classification. Includes fact page and glossary.