Readers tag along with scientists as they uncover intriguing adaptations that help animals survive in their environments. This colorful book explains the electric eel's hunting tactics and an unexpected defense strategy, why some fish sleep in mucous cocoons, how jumping spiders hear from across a room, what the shape of a European eel's head reveals about its diet, and why midshipman fish sing only at night. Based largely on primary sources, including interviews with the scientists, illustrated with original research and stock photographs, and complemented with a hands-on activity, this volume opens a window into the world of scientists as they uncover animal secrets that vividly complement basic biological principles.