WILLIAM ERVIN / SCIENCE PHOTO LIBRARY WILLIAM ERVIN / SCIENCE PHOTO LIBRARY
American bighorn. View of a male American bighorn or mountain sheep, Ovis canadensis, on snow- covered terrain. Both the males and females of this species have spiral horns which can reach 50 cm in length on the ram. The status of each male within the flock is settled by long duels between males using these horns. American bighorns are found on pasture in the Rocky Mountains where they feed on grasses. Photographed in Yellowstone National Park, Wyoming, USA.
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