By Stephen Beech

T. rex's story has been turned on its head by a new discovery about one of the world's most famous fossil finds.

One of the creatures locked in the “Duelling Dinosaurs” specimen is not a young T. rex but a rival predator, according to American scientists.

They say the breakthrough rewrites the story of the king of dinosaurs.

It has ended one of paleontology’s longest-running debates – whether Nanotyrannus is a distinct species, or just a teenage version of Tyrannosaurus rex.

The fossil - part of the “Dueling Dinosaurs” specimen unearthed in Montana - contains two species locked in prehistoric combat: a Triceratops and a small-bodied tyrannosaur.

That tyrannosaur has now been confirmed to be a fully grown Nanotyrannus lancensis – not a teenage T. rex, as many scient

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