Do dogs have nails? Why do cats have claws? Can our nails keep growing forever? These are just some of the questions readers will be able to answer after exploring this fascinating and fact-filled guide to beginner biology. The age-appropriate text introduces readers to basic facts about what nails look like and why creatures have them, inviting readers to compare and contrast. Early learners are sure to be delighted by the combination of colorful photographs and charming illustrations. Even reluctant readers can find learning about science fun!