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Sir David Attenborough has been an avid fossil collector since he was a young boy living in Leicestershire.

But he's never come across a find quite like this - the huge skull of a 150 million year-old sea monster, found on a beach in Dorset.

It belonged to the most formidable predator of the Jurassic world - a pliosaur, a ferocious marine reptile that terrorised the oceans, and also the largest marine reptile that ever lived.

The 2m-long fossil is one of the most complete specimens of its type ever discovered and is giving new insights into this ancient predator. The skull will be featured in a special David Attenborough programme on Â鶹Éç One on New Year's Day.

The Â鶹Éç's Rebecca Morelle has the story.