Ankylosaurus was a plant-eating dinosaur that lived on Earth around 65 million years ago. This herbivore was no easy prey--it had a powerful club on the end of its tail that scientists believe would have broken the bones of any attackers. If that did not work, its skin was covered in thick knobs and plates of bony armor. Full-color images, photographs of fossils, and fascinating information will inspire students to find out more about this plant-eating tank of the late Cretaceous period.