WASHINGTON — Back at the dawn of the dinosaur era, a quick-moving predator set the stage for the famous and fearsome giants that followed in its footsteps, according to new research.
Early T. rex ancestor found in South America
Thursday, January 13, 2011 | 5:18 p.m. CST;
updated 9:27 p.m. CST, Thursday, January 13, 2011
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