What makes a frog an amphibian and not a reptile or a mammal? Readers discover the answer to this important question as they learn to classify animals based on common characteristics. This essential science curriculum topic is presented in an engaging way, through fun facts about amphibians and the characteristics that separate them from other animals. Eye-catching fact boxes and helpful graphic organizers, including detailed diagrams provide additional information. Readers also find vibrant photographs of amazing amphibians in their natural habitats with each turn of the page.