Two bighorn sheep (Ovis canadensis) rams head butting, Clear Creek County, Colorado, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams head butting, Clear Creek County, Colorado, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams butting heads during the rut, Clear Creek County, Colorado, United States of America, North America

Rocky Mountain Bighorn Sheep Rams (Ovis canadensis) head-butting, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Two bighorn sheep (Ovis canadensis) rams butting heads during the rut, Clear Creek County, Colorado, United States of America, North America

Big Horn Rams butting heads in the rut, Ovis canadensis; Big Horn Sheep; Big Horn Rams Butting Heads; Big Horn Rams in the rut

Dall's sheep (ovis dalli) rams hitting heads together during dominance display, butting heads, in autumn, denali national park, Alaska, united states of america

Sepia image of Plains Bison (Bison bison bison) jousting at Elk Island National Park; Alberta, Canada