This old bull was mammoth! Probably the largest bison we saw on our entire stay in Yellowstone and Grand Teton National Parks last July (2009). He was also the most aggressive by far. This was right next to the road (only needed about 70mm in focal length)... I hopped out of the car really quick, fired off about 10 shots and then headed off as I did not want to stick around. I don't think he noticed us as he was a bit preoccupied with the a smaller male, both competing over the same woman. This is taken in Antelope Flats in Grand Teton National Park. Single RAW exposure. B+W C-PL and slight level adjustments in Photoshop CS4. [ Most Interesting | Set: Grand Teton National Park | View Large ]