Mo Willems, creator of the revolutionary, award-winning, best-selling Elephant & Piggie series, is back with another breakout beginning-reader series. This time, an ensemble cast of Squirrels, acorns, and pop-in guests host a page-turning extravaganza! Each book features a funny, furry adventure AND bonus jokes, quirky quizzes, nutty fact formats, and so, so many squirrels!

In I Lost My Tooth!, Zoom Squirrel has lost his front tooth. The Squirrels leap to the rescue to find the lost tooth. When they discover it is a baby tooth that is lost, the stakes are even higher. What will become of the poor, lost, sad, hungry, baby tooth!?