These bighorn sheep were grazing beside the road between Big Sky and Yellowstone National Park
Date 3 February 2009
Source Feb 3, 2009 - Bighorn Sheep
Author Dennis from Atlanta http://www.flickr.com/photos/dennis_matheson/
Source: https://commons.wikimedia.org/wiki/File:Bighorn_snow.jpg

The bighorn sheep (Ovis canadensis) is a species of sheep native to North America named for its large horns. Bighorn sheep are named for the large, curved horns borne by the rams (males). Ewes (females) also have horns, but they are shorter with less curvature.
Order: Artiodactyla
Family: Bovidae
Subfamily: Caprinae
Genus: Ovis
Species: Ovis canadensis Shaw, 1804
Subspecies:
Ovis canadensis canadensis - Rocky Mountain bighorn sheep
Ovis canadensis sierrae - Sierra Nevada bighorn sheep
Ovis canadensis nelsoni - Desert bighorn sheep
Synonyms:
Ovis cervina Desmarest
Ovis montana Cuvier