Dolphins and sharks：a nonfiction companion to Dolphins at daybreak Dolphins and sharks：a nonfiction companion to Magic Tree House #9: Dolphins at daybreak Knights and castles：a nonfiction companion to the knight at dawn Dinosaurs：a nonfiction companion to Dinosaurs before dark Penguins and Antarctica：a nonfiction companion to Eve of the emperor penguins Snakes and other reptiles /：a nonfiction companion to A Crazy with Cobras Snakes and other reptiles：a nonfiction companion to A crazy day with cobras Penguins and Antarctica :：a nonfiction companion to Eveof the emperor penguins / Sharks and other predators：a nonfiction companion to Shadow of the shark