What happens when a rat's tooth wears out from biting through really hard material, like wire? How can a mouse jump straight up nearly seven times its body length? How does a rat's long, naked tail help it regulate its body temperature? Outside and Inside Rats and Mice answers all these questions and many others. With stunning color photographs of rats and mice -- from developing babies to adults -- and clear, accessible text, Sandra Markle invites children to learn all about these unique and fascinating creatures.Curious young readers will delight in this close look at rats and mice -- from the inside out!