Kids who have torn through dinosaur books are the ideal audience for this introduction to prehistoric sea creatures, part of the Mega-Cool Megafauna series (4 titles). Photos of fossils and illustrations of aquatic megafauna (almost all labeled) fill the splashy pages of this volume, and the array of creatures is impressive: beyond the typical plesiosaur and megalodon, this book also profiles ancient sea cows, whales, fish, and turtles that dwarf their contemporary descendants. Occasionally, the layout makes the text a bit hard to follow, and readers might need some adult help with a few confusing descriptions, but the high-interest topic and eyecatching artwork of giant animals in action will find plenty of fans. A relative-sizes chart in the back matter helps put things into perspective, and follow-up questions will help aid reading comprehension.
—Booklist
