The bighorn sheep is the mammalian symbol of Colorado Parks and Wildlife and Colorado’s official animal. Colorado is home to the largest population of the species anywhere. The animals are five to six feet long with a tail three to six inches in length. Rams weigh 150-250 pounds, ewes 120-200. Males are about three feet high at the shoulder, ewes slightly less. Color is usually grayish brown, with a paler belly and a white rump patch. The massive, coiled horns of mature rams may make up to 10 percent of the body weight. Ewes have spike-like horns.