The enormity of a prehistoric mega-shark made famous in Hollywood films has finally been revealed by researchers.

Until now, only the length of the Otodus Megalodon, as featured in the 2018 film The Meg, had been estimated from fossils of its teeth.

However a team from Swansea and Bristol universities have combined maths with nature to reveal just how big it was.

The study has been published in the journal Scientific Reports.

Researchers used mathematical methods and comparisons with living relatives to find the overall size of the megalodon, which lived from about 23 million to three million years ago.