Here's another Yellowstone story - myself and a buddy made the long haul to Yellowstone specifically to fish for post-spawn cutthroats in a tributary of Yellowstone Lake. 12 hour drive, few hour nap in the car, and then it was off down the trail for a five mile hike into the creek. Beautiful sunny day, we enjoyed watching the occasional buffalo grazing along the trail. For the last mile or so to the creek, we followed a large buffalo that was ahead of us on the trail. As we neared the creek, we approched the buffalo that had apparrently stopped to graze. As we came within a hundred yards or so of the "buffalo", it stood up on it's hind legs and began sniffing the air !!! Needless to say, neither of us wanted to share the creek with this large grizzly, so we ended up hiking back to the car without ever wetting a line.