WOW!!! I've only seen one in my life and that was near Yosemite. A buddy and I had backpacked into an area to see if it would be good for deer hunting and while watching a bunch of does feeding on the side of a ridge, they all of a sudden disappeared. We both noticed it and found it odd that we couldn't see a single deer anymore. I think there where 7 or 8 of them out in the open before the vanished. Then out of nowhere, a mountain lion appeared from the left and walked across the ridge where all the deer had been. We watched him for a minute or so before it went into the trees. This was late in the day, but still plenty of light out. What amazed me the most was how it seemed to float across the rocks. Very fluid in its movement. Once it was out of sight, the deer just started showing up again. There was a very weird feeling to all of it.