Dinosaurs roamed the earth for 160 million years. Some 65.5 million years ago, an asteroid collided with earth in an event, now known as the Cretaceous-Tertiary, or ..
Tyrannosaurus rex was one of the largest meat-eating dinosaurs that ever lived. Everything about this ferocious predator, from its thick, heavy skull to its 4-foot-long (1.2-meter-long) jaw, ..
