13777609 - Three Bighorn Sheep rams (Ovis canadensis) face off in front of a group of ewes during the rut in the North Fork of the Shoshone River Valley near Yellowstone National Park; Wyoming, United States of America13777601 - Large Bighorn Sheep ram (Ovis canadensis) with massive horns performs lip curl (flehmen) display during the rut near Yellowstone National Park; Montana, United States of America13777631 - Bighorn Sheep rams (Ovis canadensis) stand together during the rut near Yellowstone National Park; Montana, United States of America
