News From the Field
Two Vortex Trails With One Stroke
February 25, 2013
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 at the University of California, Riverside, proposed 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.
University of California, Riverside
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