TINY "T. REX" PICTURES: New Dinosaur Species Found

TINY ''T. REX'' PICTURES: New Dinosaur Species Found
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Newly discovered Raptorex gets underfoot of its nearly identical, though a hundred times heavier, descendant, T. rex in an artist's conception. The tiny T. rex ancestor is not known to have lived alongside its titanic ancestor.

The Raptorex find, announced September 17, 2009, runs counter to previous theories, which had said that stumpy arms were a relatively recent evolutionary development for T. rex.

Prior to Raptorex, said paleontologist Thomas Holtz of the University of Maryland, "we didn't know where and when in the history of the tyrannosaurs this arm-shortening occurred."
—Illustration courtesy Todd Marshall
 
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