A lizardfish’s open mouth reveals a surprise. "It seemed that the lizardfish was trying to swallow the other fish tail-first before it got stuck in its throat," says Pokoj. "Both fish looked to be in some distress. Lizardfish are ambush predators and swim away if a diver gets too close, so this behaviour was highly unusual. The lizardfish kept its mouth open as if it wanted the fish inside its mouth to escape."