In this fascinating clip, bottlenose dolphins are observed churning up seafloor mud to form a ring that traps fish. The technique has been developed independently by dolphins near Mexico and Florida.

The mud ring hunting strategy is a case of blindsiding prey. A “ring maker” dolphin circles near the ocean floor and traps fish behind a ring of mud as others lie in wait with mouths open, lunging to catch any fish attempting to escape the mud by jumping out of the water.