The Walk Up Whistle

This one was a little bit farther down the trail, up on a ridge top. And it's really quiet night, and a, all of a sudden, you hear this rustling coming up the hill. The closer it gets, it sounds by peetle. To me, it sounds like two legs walking. But i've had so many people i've shown that to, i mean, outdoors, an hunters, i've had wild life biologists look at it and listen to it, and nobody can identify what that is.