Outside the museum, and providing the greatest appeal to passing visitors, is the Dinosaur Garden, a prehistoric zoo of full-size replicas ranging in age from Pennsylvanian through Pleistocene. The garden includes a 20-foot Tyrannosaurus with six-inch, knife-like teeth, a horned Triceratops, six-ton Stegosaurus, winged Pteranodon and other full-size prehistoric animal replicas.