American Bison: Lamar Valley, Yellowstone National Park, October 2024 — The rut was really over by the time we got to Yellowstone, but there was still some rutting behavior among the young bulls. Just play but fun to watch. Head butting is part of the dominance ritual, and helps the herd to know who is boss. Sony a6700 with Tamron 50-400 Di iii at 600mm equivalent. Program mode with my birds in flight and action modifications. Processed in Photomator and assembled in FrameMagic.