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Named for the large, curved horns borne by the rams (males). Ewes (females) also have horns, but they are shorter with less curvature. They range in colour from light brown to grayish or dark, chocolate brown, with a white rump and lining on the backs of all four legs.
Banff National Park, Alberta, Canada. Conservation Status: vulnerable (N3N4) in Canada (NatureServe).