New T. Rex-like Dinosaur Discovered

Artist's illustration of Tyrannosaur rex and Raptorex kriegsteini.  Image credit:  Todd Marshall/Science

Artist's illustration of Tyrannosaur rex and Raptorex kriegsteini. Image credit: Todd Marshall/Science

The discovery of a new dinosaur species, Raptorex kriegsteini, has shed new light on the evolution of the mighty Tyrannosaurus rex.  Both share distinctive features:  strong back legs, tiny forelimbs, dagger-like teeth, a whip-like tail, and a disproportionately large head.  But, the difference is size.  The new discovery stood only 9 feet tall.  It was thought that these signature T. rex features evolved as a consequence of its large size, so finding these same feature in a smaller package changes the way scientists look at T. rex.  For more information on the discovery, see National Geographic News.

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