Allosaur and Stegosaur Skeletons

Photograph by James Steinberg/Photo Researchers, Inc.

Ghosts of an earlier age, an Allosaurus and a Stegosaurus brace for battle at the Denver Museum in Colorado. Most museum exhibits of dinosaurs do not use actual dinosaur bones, but rather molds and casts. Technicians create fiberglass replicas of bones that are mounted and posed in lifelike positions on metal frames.