Darrin Lunde is the collections manager in the Division of Mammals at the Smithsonian's National Museum of Natural History in Washington, DC. He has written several books introducing animals to children, including the Theodor Seuss Geisel Honor book Hello, Bumblebee Bat, as well as Whose Poop Is That? and other books in the Whose Is THAT? series. Erica J. Chen enjoys creating fresh illustrations full of fun details and awkward but loveable animals. She is the illustrator of Who's Making All That NOISE?!, Purr-Im Time , Oh Deer! , and other picture books. www.ericajchen.com.