White noise could warn birds to avoid colliding with tall structures
Projecting white noise in the direction of oncoming birds could stop them from colliding with buildings or wind turbines.
Birds keep their heads down to streamline their bodies as they fly, says John Swaddle at the College of William & Mary in Virginia. So, visual cues may not be enough to warn them of oncoming structures. That is why billions of birds around the world, particularly those that migrate long distances, die in collisions with manufactured structures each year.