Scientists have discovered a new species of dinosaur - in the collection of a Mongolian museum - that they say “rewrites” the evolutionary history of tyrannosaurs.

Researchers concluded that two 86 million-year-old skeletons they studied belonged to a species that is now the closest known ancestor of all tyrannosaurs - the group of predators that includes the iconic T.rex.

The researchers named the species Khankhuuluu (pronounced khan-KOO-loo) mongoliensis, meaning Dragon Prince of Mongolia.

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