Groundhog Day! by Gail Gibbons, What exactly is Groundhog day, and why is it celebrated? Using clear text and vivid illustrations, readers will learn all about groundhogs, and explore the history that is behind this unusual holiday. Readers will also explore the different traditions across the country relating to this celebration, and includes a page of groundhog trivia. Paperback, 32 pages. Recommended for ages 6 to 9 years old.