Dinosaur lore has it that Tyrannosaurus rex, the king of the giant lizards, was the meanest creature ever to roam the earth: 10 m (33 ft.) long with 15-cm (6-in.) teeth and a voracious appetite. But fossilized claw, skull and jaw bones found in a quarry in eastern Utah point to a dinosaur that, while smaller than Tyrannosaurus, was probably a whole lot nastier. Labeled the "Utahraptor" until a more suitable scientific name can be found, the 7-m (20-ft.), one-ton beast is the largest specimen ever seen of a variety of dinosaur known as the Velociraptor, an upright, fast-moving carnivore that...
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