Strange and wonderful creatures shared the earth with the dinosaurs. Kronosaurus ruled the seas with teeth as big as bananas and jaws more powerful than a Tyrannosaurus rex's. Flying Pterodaustro spit water through hundreds of long, thin teeth. Deinosuchus, the giant crocodile, preyed on unlucky dinosaurs. These and other amazing animals are introduced to young readers in easy-to-read text and dynamic illustrations.

After the age of the dinosaurs, strange and powerful mammals ruled the earth...

Dinosaurs were the biggest, most powerful animals that ever walked the earth. Now they are all gone. How did they become extinct?