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.<br />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.