It's a whistle, a high-pitched “bzzz” reminiscent of the beating of a mosquito's wings.
This unpleasant noise, produced by a box with a camouflage pattern, would scare away… boars.
The Fédération des chasseurs de l'Oise has been experimenting for a month with this ultrasonic repellent, called Rex, which is supposed to act as a virtual fence around the fields.
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