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. Humor will draw elementary-aged readers into this illustrated life science lesson about animal diversity and classification. When young Randy the rat overhears Forrest the frog grumbling about mammals, Randy sets out on a mission to find out what exactly a mammal is. After interviewing other animals in the forest and learning about the characteristics of mammals, Randy realizes that he too is a mammal! 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, glossary, and resources for further research.