Above, the skull of Raptorex is dwarfed by the skull of “Sue,” the famous adult T. rex at the Field Museum. (Credit: Paul Sereno)
U. CHICAGO (US)—A 9-foot dinosaur from northeastern China had evolved all the hallmark anatomical features of Tyrannosaurus rex at least 125 million years ago, including a large head compared to its torso, tiny arms, and lanky feet well-suited for running. Continue…
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