What is it? Horned sea "monster" washes up on shore

It looks like something right out of a mythology book, but it has many along the coast of Spain scratching their heads.  The mysterious creature has what looks like horns sprouting from its head and stretches about 13 feet down the beach.

Whatever it is, some believe it's an oarfish, a mutant fish or even a shark species, it was in the advanced stages of decomposition.