Researchers from Polytechnic Institute of New York University designed their fish to mimic the tail propulsion of a real swimming fish, and tested it out with a variety of tail beat frequencies and flow speeds.

In nature, fish at the front of a school beat their tails more frequently, creating a wake in which their followers gather. The followers' tails swish noticeably more slowly, leading researchers to believe that they're getting a hydrodynamic advantage from the leaders’ hard work.

Read the complete story from TG Daily.