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flag Paleontologists reclassify the "Dueling Dinosaurs" fossil as a mature Nanotyrannus lancensis, not a young T. rex, based on growth and anatomy.

flag Paleontologists at the North Carolina Museum of Natural Sciences have reclassified the "Dueling Dinosaurs" fossil—a nearly complete tyrannosaur found in Montana—as a distinct species, Nanotyrannus lancensis, not a juvenile T. rex. flag Using growth ring analysis, 3D modeling, and skeletal comparisons, researchers determined the animal was a fully mature 20-year-old with key differences from T. rex, including more teeth, fewer tail vertebrae, and powerful arms with large claws. flag The findings challenge decades of scientific consensus that T. rex was the only large tyrannosaur in the late Cretaceous, suggesting multiple species coexisted. flag The fossil is now part of a public research exhibit at the museum, where scientists study it in real time.

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