While bowhunting some years ago, my partner and I spotted a bull bedded down in a 1/2 acre patch of brush out in the middle of a large open area. We spotted him from the top of a ridge. We made a 1 mile loop to get down wind, then sneaked in and set up to call. My partner was sweet lips while I was on weapons duty. We must have called for an hour before we decided that he'd winded or spotted us and left while we were getting there. Wrong. I moved and he took off. He'd been bedded within 100 yds of us the whole time.
