The bighorn sheep (Ovis canadensis) is a species of sheep that lives in the western half of North America.[2][3][4][5] Their name comes from their large horns. Their horns can weigh up to 30 pounds (14 kg). However, the sheep themselves weigh up to 300 pounds (140 kg).
↑Allen J.A. 1912. [1]Archived 2015-05-07 at the Wayback Machine
Historical and nomenclatorial notes on North American sheep. Bulletin of the AMNHv. 31, article 1