What predator could claim as prey a fully-grown, great white shark? There is only one that comes to mind, but you see it's supposed to be extinct. It is a prehistoric fish known as Carcharodon Megalodon, or as the sailors frequenting the Sea of Cortez have named it, El Demonio Negro, and according to them it is still very much alive.
Stranger Than Fiction Stories by M.P. Pellicer