Big horn sheep coloring pages

Sep 28 2019

Ovis canadensis is one of three species of mountain sheep in North America and Siberia; the other two species being O. dalli, which includes Dall sheep and Stone’s sheep, and the Siberian snow sheep, O. nivicola. Wild sheep crossed the Bering land bridge from Siberia into Alaska during the Pleistocene (about 750,000 years ago) and subsequently spread through western North America as far south as Baja California and northwestern mainland Mexico. Divergence from their closest Asian ancestor (snow sheep) occurred about 600,000 years ago. In North America, wild sheep diverged into two extant species—Dall sheep, which occupy Alaska and northwestern Canada, and bighorn sheep, which range from southwestern Canada to Mexico. However, the status of these species is questionable given that hybridization has occurred between them in their recent evolutionary history.

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