It is the rutting season for Yellowstone’s elk herds. This male sending his rutting call. It is called bugling. It is a sharp, distinctive sound that begins deep and resonant, and then becomes a high-pitched bird like squeal. He is proclaiming his dominance, challenging distant bulls and hopefully attracting females to his harem. The fog-shrouded forest greatly enhances the mood of this image. It hides both challengers and prospective mates alike.