One of the places I hunt in NM, is right under an area that fighter pilots train in. Lots of low level noise and the occasional sonic boom as they do there manuvers. The deer and elk don't even flinch. They are also totally undisturbed by ranch hands driving around in the old rattletrap ranch trucks or logging trucks with no mufflers. But if a hunter comes sneaking along and steps on a twig, they will high tail it. They know danger comes quitely.
