Makes you wonder how many you've looked straight at and never saw.
A few years ago on a WY mule deer hunt, I turned a corner and spotted about 10 does feeding about 800 yards from me. I dropped down and scanned and scanned with and without binocs. After about 45 minutes, I decided I wasn't going to just sit there watching does. When I stood up, 3 bucks jumped up from under he shade of a rock I had scanned at least a dozen times. Oh well. Live and learn!