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Story summary
- Researchers at the North Carolina Museum of Natural Sciences confirmed the small dinosaur is Nanotyrannus lancensis.
- The finding was published in Nature, challenging decades of Tyrannosaurus rex assumptions.
- Growth rings in the fossils show Nanotyrannus lancensis was fully grown at about 20 years old.
- A second species named Nanotyrannus lethaeus was identified, suggesting multiple tyrannosaur species coexisted in late Cretaceous North America.
