The bighorn sheep (Ovis canadensis) is a species of sheep native to North America. It is named for its large horns. A pair of horns might weigh up to 14 kg (30 lb); the sheep typically weigh up to 143 kg (315 lb). Sheep originally crossed to North America over the Bering Land Bridge from Siberia; the population in North America peaked in the millions, and the bighorn sheep entered into the mythology of Native Americans. By 1900, the population had crashed to several thousand, due to diseases introduced through European livestock and overhunting.
The snow sheep (Ovis nivicola), or Siberian bighorn sheep, is a species of sheep from the mountainous areas in the northeast of Siberia.
NOTE: Not to be confused with the Boreray sheep (Ovis aries) (called the Bighorn sheep here in Cantr).