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While larger dinosaurs are comparatively well-known, finding smaller species paints a more complete picture of life before the mass extinction
Researchers say they've identified the oldest known Tyrannosaurus, shaking up the ongoing debate over how and when the dinosaurs arrived in North America.
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The remains, dug up in the 1980s, might shed light on T. rex's mysterious origins, according to a new paper
A dinosaur known only from a partial skull has been dubbed Tyrannosaurus mcraensis, adding a new twist to long-running debates about putative relatives of Tyrannosaurus rex
A dinosaur skull first discovered in the 1980s was originally catalogued as a T. rex. Now some scientists argue it represents a new species of tyrannosaur and could shed light on where the massive animals originated