Ten little caterpillars are out and about in our big, wide world—come join them! You never know what you might find... A butterfly, perhaps? Readers of all ages have celebrated the work of Bill Martin Jr and Lois Ehlert ever since their first collaboration on Chicka Chicka Boom Boom more than twenty-five years ago. Now these two picture-book geniuses are together again in this dynamic and visually stunning counting-and-natural history picture book that's just perfect for reading aloud—and comes complete with a glossary filled with intriguing information about all of the caterpillar stars!