Many species of owl are able to hunt in effective silence by suppressing their noise at sound frequencies above 1.6 kilohertz (kHz) - over the range that can be heard by humans. A team of researchers studying the acoustics of owl flight is working to pinpoint the mechanisms that accomplish this virtual silence to improve man-made aerodynamic design – of wind turbines, aircraft, naval ships and, even, automobiles.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2016/11/161116123404.htm
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