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A deer horn, or deer whistle, is a sonic generator (whistle) mounted on automobiles intended to help prevent collisions with deer. A Shu-Roo is a similar device used in Australia to scare off kangaroos. Air moving through the device produces ultrasound or other high-frequency sound waves, intended to warn deer of a vehicle's approach. Deer are highly unpredictable, skittish animals whose normal reaction to an unfamiliar sound is to stop, look and listen to determine if they are being threatened.
Scientific studies of these devices have indicated that they do not in fact reduce collisions.
In addition to the Georgia and Wisconsin studies, a study by the Ohio State Police Department also indicated the whistles are ineffective. Independent testing carried out by the Department of Zoology at the University of Melbourne reached the same conclusion about shu-roos and kangaroos.
See also Shu-Roo.