BRIAN SKERRY is a photojournalist specializing in marine wildlife and underwater environments. Since 1998 he has been a contract photographer forNational Geographicmagazinecovering a wide range of subjects and stories. In 2014 he was named a National Geographic Photography Fellow. In 2015 Skerry was named a Nikon Ambassador, and in 2017 he received the National Geographic Photographer's Photographer Award. Kathleen Weidner Zoehfeldis an award-winning author of more than 70 books for children. Her titles include What Lives in a Shell?, winner of the American Association for the Advancement of Science's Best Children's Science Picture Book award; What Is the World Made Of?, a Children's Book-of-the-Month Club main selection; and What's Alive?, also named an AAAS Best Children's Science Picture Book.