I was out in the Big Horns of WY a couple weeks ago, hiking down a mountain toward my vehicle as it was getting dark. Off to the side in some trees I could hear cows chirping. Over the next minutes a herd of what I first thought must be at least 100 elk started passing in front of me.
Well, 5 minutes later I had counted well over 500 elk, including only about 10 or 12 bulls, nothing bigger than a few smallish 5's and 6's.
But quite an experience nonetheless. It was much later than the picture would indicate, my camera is very light sensitive at its highest ISO setting.