Analysis of Montana fossils shows the battling predator was a fully grown Nanotyrannus, not a young T rex
The fossilised remains of two dinosaurs locked in combat have unleashed a fresh drama, suggesting diminutive specimens thought to be teenagers of Tyrannosaurus rex could instead belong to separate, smaller species.
The “duelling dinosaurs” fossil, which reveals a triceratops in battle with a medium-sized tyrannosaur, was unearthed in Montana by commercial fossil hunters in 2006, and dates to shortly before the asteroid strike that ended the reign of the dinosaurs 66m years ago.
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