Now this is cool. At least if you're into nature.

National Geographic has pictures from Australia's Great Barrier Reef of a shark eating another shark.

This means absolutely nothing to me, but the predator is a tasseled wobbegong shark (who apparently has very good camouflage skills) and the eaten is a brownbanded bamboo shark (who is apparently very tasty).

Two researchers stumbled on this during a diving expedition.  It's not certain, but they think this may be the first film documentation of shark-on-shark violence.

CLICK HERE for the NatGeo website and to read the story and see more pictures.

Interesting to see what goes on well below the surface.