The Rocky Mountain Bighorn is the largest sheep in North America and occasionally they can weigh as much as 300 pounds. A mature Rocky Mountain bighorn ram will generally weigh 200 pounds and in most cases even more. Females are considerably smaller. This species of sheep is a heavy-bodied animal with massive horns and a full, coarse, grayish-brown coat. This Bighorn has a white muzzle, as are the backs of the front legs and insides of hind legs. The belly is white in the groin area, with the white color sometimes extending forward onto the chest. The rump patch is large and white, surrounding the dark tail. This sheep has horns that are very thick at the base and tend to carry the thickness throughout their length. Typically, the horns curl close to the head and are broomed off at the eyes where further growth would interfere with vision. The female Rocky Mountain Bighorn have short, thin horns.
These sheep can be found on mountain ridges and in basins, usually above timber line, but often in timbered areas as well. The map below shows the general locations of the Bighorns in Montana.
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