Sea otters sleep in a cradle of kelp. Squid swim backwards, jet-propelled. Magnificent cut-paper collages depict 16 animals and their varied behavior in the water. Kangaroos, pelicans, polar bears, tigers, hippos, wildebeests, walruses, and armadillos are among those shown, accompanied by minimal, insightful text in the form of a rhyming poem. End notes offer more details to the curious, who learn how the kangaroo keeps its baby dry (strong muscles around the pouch keep it closed) or how the hippo sleeps underwater (it comes up for air every five minutes). Simple and straightforward, this introduction is sure to build interest in animal behavior, while the stunning colors and textures of Riley's art make perusing it a special pleasure.