Eyewitness Shark: Dive into the fascinating world of sharks (DK Eyewitness)Discover the mighty fish that have ruled the oceans since prehistoric times in this picture packed guide to the extraordinary shark family. Did you know that sharks first appeared in the oceans 200 million years before the dinosaurs, and that they have an electrical sixth sense that helps them locate their prey? How dangerous is a great white shark? Can a whale shark really grow as big as a city bus? If you find yourself seeking the answers to these