Sussex fossil hunter Andy Ottaway has found a fossil bone of a marine reptile from the dinosaur age in the chalk cliffs near Seaford.
It's only a few inches long but it tells a story which is tens of millions of years old.
Because the fragment is so small it's not possible to tell whether the bone belonged to a plesiosaur or a mosasaur, but both creatures could grow up to 50 feet.
Which makes this fossil find all the more remarkable because the bone markings suggest that the creature was eaten by another vicious predator which was big enough to tackle its massive victim.
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