The only time I've seen any they were *way* up on the side of a mountain in Glacier National Park. I wouldn't have noticed them if someone hadn't pointed them out to me.
The valleys in Glacier National Park form a radius,..they're very rounded and at the upper elevations the sides of them are almost vertical.
The goats were almost at the top of the ridge gazing on moss, I guess. There was no visible vegetation up there.
It was much steeper than a man could stand on. How they worked their way along the ridge was really something to see. I wouldn't have thought anything could walk around on that nearly vertical surface.