Enigmatic Dinosaur Skull Sparks Debate over Tyrannosaur Evolution

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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


More... (https://www.scientificamerican.com/article/enigmatic-dinosaur-skull-sparks-debate-over-tyrannosaur-evolution/)