Almost everything about this dinosaur -- the four-foot-long jaw, the six-inch-long teeth, and the huge thigh bones -- bespeaks the enormous power of Tyrannosaurus rex, one of the largest theropod (or meat-eating) dinosaurs that ever existed. Most of the bones here are real, fossilized Tyrannosaurus bones. They are from two specimens discovered in Montana by Museum paleontologist Barnum Brown in 1902 and 1908.
Tyrannosaurus rex was a fierce predator that walked on two powerful legs. This meat-eater had a huge head with large, pointed, replaceable teeth and well-developed jaw muscles. It had tiny arms, each with two fingers. Each bird-like foot had three large toes, all equipped with claws (plus a little dewclaw on a tiny, vestigial fourth toe). T. rex had a slim, stiff, pointed tail that provided balance and allowed quick turns while running. T. rex's neck was short and muscular. Its body was solidly built but its bones were hollow.
See also: Dinosaur, Pterodactyl