It was one of those fish stories that are not to be believed - but in this case professional diver Scott Gardner had an underwater camera to document what he saw. Gardner was returning from a dive off Australia's Great Barrier Reef when he heard a cracking noise. A tuskfish hovering nearby had grabbed a clam in its jaws. Gardner began snapping away at the fish as it grasped the shell and rolled onto its side to smash its prey on the rock until the shell broke apart. This may be the first time anyone has photographed a fish using a tool. You can read his full account here.