We had heard that there was a Bald Eagle nest along the road to the West Entrance of Yellowstone, and we ended up spending a fair amount of time there. On this particular occasion, we saw the 2 juveniles in the nest, and somebody spotted one of the adults along a hillside by the Madison River. It was quite far away, but we kept checking to see if or when it would take off. After quite a while, it took to the air, and as it flew almost directly over us, another bird came out of nowhere. I tracked it as best I could, and snapped a few frames, not realizing at the time exactly what was happening, or what the other bird was. It was over in a second or so. This image is the best of the 2 or 3 that I shot, is a fairly small crop, and is not critically sharp, unfortunately. Still, it was an unusual event, and hopefully worth including here.