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This sketch by Robert DePalma depicts the attack that may have resulted in the tooth of a Tyrannosaurus rex becoming lodged in the vertebrae of a hadrosaur, or "duck-billed" dinosaur. DePalma, who earned a master's degree from Kansas University in 2010, discovered a hadrosaur fossil with a T. rex tooth embedded inside, confirming that the T. rex was a predator, not a scavenger that fed on already-dead animals. A journal article describing the discovery, by DePalma and several other KU researchers, was published this week.

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