With its massive head, enormous jaws, and formidable teeth, Tyrannosaurus rex has long been the young person's favorite creepy carnivore in the Mesozoic zoo. Nor has T. rex been ignored by the scientific community, as this new collection amply demonstrates. Scientists explore such questions as why T. rex had such small forelimbs; how the dinosaur moved; what bone pathologies tell us about life in the Cretaceous; and whether T. rex was a predator, a scavenger, or both. There are reports on newly discovered skeletons, on variation and sexual dimorphism, and how the big beasts chewed. The methods used by the contributors to unlock the mysteries of T. rex range from "old fashioned" stratigraphy to contemporary computer modeling. Together they yield a wealth of new information about one of the dinosaur world's most famous carnivores. An enclosed CD-ROM presents additional photographic and filmed reconstructions of the mighty beast.