A tyrannosaur fossil from Montana, part of the 'Dueling Dinosaurs' specimens, was determined to belong to an approximately 20-year-old animal that had finished growing, supporting the case that it represents Nanotyrannus lancensis rather than a juvenile Tyrannosaurus rex.
Sources
- The Ten Most Significant Science Stories of 2025, From Medical ... (smithsonianmag.com)
- https://www.cnn.com/2025/10/30/science/dueling-dinosaurs-fossil-nanotyrannus-tyrannosaurus-rex (cnn.com)
- https://www.nationalgeographic.com/science/article/nanotyrannus-t-rex-dueling-dinosaur-fossil-debate (nationalgeographic.com)
- https://news.ncsu.edu/2025/10/nanotyrannus-confirmed-dueling-dinosaurs-fossil-rewrites-the-story-of-t-rex/ (news.ncsu.edu)
- https://www.sci.news/paleontology/nanotyrannus-lethaeus-14323.html (sci.news)
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