Introduction by Dr. Paul Sereno. Imagine a crocodile almost as long as Tyrannosaurus rex and just as fierce! That?s SuperCroc, the giant Sarcosuchus fossil discovered by Paul Sereno, a National Geographic explorer-in-residence. Crocodiles and their ancestors are some of the most successful animals that ever lived. At the time of T. rex, crocs ranged in size from 2 feet to over 40 feet long. They lived on land, in swamps, and in the sea. Some, like SuperCroc, were fierce predators. Some were heavily armoredplant eaters. And when all of the dinosaurs (except birds) became extinct, the crocs lived on, becoming the crocodiles, alligators, and gharials of today. Combining fantastic art and photography with vivid descriptions, Chris Sloan draws young readers into the latest discoveries about the lives of these amazing animals.