A sperm whale has the biggest brain of any animal on Earth, while a giant squid's brain is the size of a donut. A whale can dive a quarter mile deep, but no one even knows just how deep a squid can swim. This compelling and easy-to-read format offers lots of cool facts about each of these amazing animals and a fun opportunity to decide who really rules the sea! The book is packed with photos, charts, illustrations, and amazing facts. 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.