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Hummingbird Flight: Two Vortex Trails With One Stroke


ScienceDaily

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As of today, the Wikipedia entry for the hummingbird explains that the bird's flight generates in its wake a single trail of vortices that helps the bird hover. But after conducting experiments with hummingbirds in the lab, researchers propose that the hummingbird produces two trails of vortices -- one under each wing per stroke -- that help generate the aerodynamic forces required for the bird to power and control its flight.mX8jP5brUZY

 

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