Millions of years ago, the oceans teemed with creatures that were every bit as fascinating and ferocious as the dinosaurs that ruled the land. These were the marine reptiles, including the massive-jawed pliosaur and the long-necked plesiosaur. This gruesome guide explores how these awesome creatures lived, how they hunted, and how we know about them today. Packed with fact-filled, easy-to-read text, quirky illustrations and side panels providing more icky information.