On the Go! Books are sturdy mini-books that introduce preschool children to vehicles of different kinds. The books are constructed of extra-thick board pages and have vivid color illustrations on every two-page spread. The simply-told stories are for Mom or Dad to read aloud while children delight in the bright and friendly pictures. In this book, kids meet Danny the Digger, who makes a large, mysterious hole. When filled with water, the hole becomes a perfect duck pond.