The bighorn sheep is Colorado’s state animal and a common sight on its high crags. Open occurrence databases hold 4,364 records for it here, most of them iNaturalist photos, taken everywhere from alpine ridgelines to sun-baked canyon walls.
Cliffs, forage, and escape terrain
A bighorn’s life is a compromise between food and safety. The sheep graze open alpine meadow and grassy slopes, but they are never far from steep, broken rock where a predator cannot follow, and that pairing of grass beside cliff dictates where they turn up. Records concentrate in the rugged high country of Clear Creek and Larimer counties, along the alpine reaches of Rocky Mountain National Park, the San Isabel National Forest, and Mount Blue Sky, and in the canyon terrain of the Western Slope around Mesa County and Colorado National Monument. Sure-footed on ledges that look impossible, ewes and lambs move together as a band while the heavy-horned rams keep their own company for much of the year.
The rut and the reason for the horns
Reports climb through the warm months when the high country opens to hikers, then thin as snow closes the passes, though the sheep hold to their windswept ranges all winter. Autumn brings the rut, when rams face off and slam their curled horns together in collisions that carry across the rock. A mature ram’s horns can weigh around 30 pounds, and his thick skull and neck are built to absorb the blows.
Status in Colorado
NatureServe ranks the bighorn S4, apparently secure. The Rocky Mountain herds that define Colorado’s high country were rebuilt through decades of reintroduction, but they stay vulnerable to disease carried by domestic sheep, so managers watch them closely.
Full species profile
