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Page last updated at 00:37 GMT, Wednesday, 4 November 2009

Oldest T. rex relative identified

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Scientists have identified the most ancient fossil relative of the predatory dinosaur Tyrannosaurus rex.

The new addition to T. rex's clan is known from a 30cm-long skull uncovered during excavations in Gloucestershire, UK, in the 1900s.

The well-preserved fossil is now held in London's Natural History Museum.

Here, Dr Angela Milner shows how the beast compared with its famous relative.

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