Watch: Sailfish ‘slasher film’ sheds light on evolution of group hunting

Divers catch amazing footage of sailfish showing that they gang up on sardine schools to hunt more efficiently. | Video copyright: Science Script: Rachael Lallensack

Once a year for 5 years, a crew of researchers would set sail off the coast of Cancun, Mexico, to locate frigate birds flocking and diving just above the ocean’s surface. The scientists weren’t actually interested in the birds—the animals merely served as a smoke signal for the mayhem unfolding below: sailfish ganging up on sardine schools. Sailfish hunting groups range in size from four to as many as 70, but their strategy is rather simplistic. | Read more ...

Rachael Lallensack