It's incredible to think that crocodiles were contemporaries of the dinosaurs. Not all crocs looked like the creatures we know today, though. Some were real monsters--such as Machimosaurus rex. It was 30 feet (10 m) long! Reptile lovers and dinosaur enthusiasts will love the details and images found in this high-interest book. They'll also review important science concepts, such as adaptation and extinction, and relish sharing the fascinating facts they absorb with their friends!