Susan Lendroth is the author of Natsumi!; Old Manhattan Has Some Farms, and Hey-Ho, to Mars We'll Go!, which was read aboard the International Space Station. She works with books and librarians at the Los Angeles Public Library.

Bob Kolar is the author and illustrator of many books for children, including Hey-Ho, to Mars We'll Go!; Stomp! Stomp!; and the Astroblast! series, the basis for the Sprout TV show. He is also the illustrator of The Boy and the Book; Slickety Quick; and The Little Vehicles series. When he's not writing and illustrating books, Bob teaches art at the Kansas City Art Institute.

"To the tune of "Here We Go 'Round the Mulberry Bush," join paleontologists as they hike the trail, scan the ground, and make a giant find."--Back cover.