There are 11 species of whales that have no teeth, and 30 species that do - up to seven inches long. This volume explores the similarities and differences among the species. It covers: what flukes and flippers are; how many blowholes whales have; why they spyhop; when they swim sideways along the ocean floor; and more. Many mysteries of whales are explained in the text and Fun Facts . There are accompanying illustrations and close-up photographs, as well as a list of related Internet sites.