The killer whale has a huge jaw with about fifty teeth, each almost four inches long! But if the killer whale loses a tooth, it will never grow back. The great white shark, on the other hand, has several rows of razor-sharp teeth, and it can lose more than 3,000 teeth in its lifetime, growing them back again and again. But teeth aren't everything, as readers will soon realize. This easy-to-read book lets kids guess which ocean predator really rules under the waves! Series Information In this innovative science series from favorite nonfiction author Jerry Pallotta, readers will learn about dangerous creatures by asking "Who would win?" Each book is illustrated with full-color pictures and features a pair of animals that rarely, if ever, meet in the wild. Young scientists will love using the book's easy-to-read facts and their own reasoning skills to decide for themselves which creature would be the winner.