The silent flight

The owl fly in perfect silence.

Inaudible even in headphones, despite passing a few centimeters from a large set of microphones in an already silent test environment. Its wings move the air without generating any spikes.

Please, note: NOT “any spikes at audible frequencies”, just no spikes. The record is a almost straight line (see the second video).
Taken from the BBC Two Natural World program.

In the first video there is the essence of the experiment.

Here we have a more complete video with some comments.

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