The bighorn sheep is a large species of sheep that can weigh up to 140 kg (300 lbs). They are named after the male’s large horns which can contribute up to 14 kg (30 lbs) to their full weight. The bighorn sheep population was, at one time, in the millions. By the 1900’s this number had plummeted to a mere several thousand due to disease and overhunting. Conservation efforts are now in place and the current population is back up to around 57,000 in North America.