Same thing here. Hair stood up on the back of my neck. Next evening, same hollow, I saw where the loud and violent grunt came from. I shot him about 10 minutes later. One of the dangest noises I had ever heard in over 20 years of bowhunting.
ORIGINAL: scsohunter
I heard that sound while bowhunting a few years back and it scared the $&^* out of me. I dont get scared very oftern but I did get up and leave the woods. Now it sounds a little silly, knowing what it actually was.