ELIZABETH SHREEVE grew up in a family of writers and scientists who taught her to pay attention to horseshoe crabs, seabirds, and other wonderful creatures along the Atlantic coastline. Now based in California, Elizabeth Shreeve writes books for young readers that celebrate the origins and diversity of life on Earth. Her books include The Upside-Down Book of Sloths and The Oddball Book of Armadillos and the award-winning Out of the Blue: How Animals Evolved from Prehistoric Seas . Learn more about her books, author visits, and fishy adventures at ElizabethShreeve.com and on social media @ShreeveBooks. RAY TROLL is an artist who has illustrated twelve books, including On an Ocean Journey , Sharkabet, Cruisin' the Fossil Freeway , Rapture of the Deep , and Planet Ocean: Dancing to the Fossil Record . He's had many major museum exhibits over the years, and is honored to have a species of ratfish, Hydrolagus trolli, and a genus of extinct herring, Trollichthys , named after him. He and his wife, Michelle, live and work in Alaska, and own and operate the Prairie Sea Gallery in Lindsborg, Kansas.