Scientists identified a new species of Tyrannosaurs that's likely a predecessor to T. Rex. The new species shows the dinosaurs got bigger a lot earlier than scientists originally thought. Upon reexamination, the scientists found that the bones belonged to a dinosaur that lived 6 million to 7 million years before T. rex existed. That means that Tyrannosaurus, "also got bigger a lot earlier than we thought," Longrich said. Despite what many scientists thought, the T. Rex wasn't the first Tyrannosaurus, but the last, Longrich said.

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Persons: Rex, —, Tyrannosaurs, Nick Longrich, Longrich, Spencer Lucas, Dean Mouhtaropoulos, mcraeensis, Rex wasn't Organizations: Service, University of Bath, NPR, Asia Locations: North America, Asia, New Mexico