Types of Bighorn Sheep in California

Desert Bighorn Sheep and Sierra Nevada bighorn sheep are the same species (Ovis canadensis) but they live in completely different habitats and are managed as separate populations. Desert Bighorn Sheep inhabit the hot, arid mountains of southern California, including the San Gabriel Mountains, San Bernardino Mountains, and the Mojave Desert region. Sierra Nevada bighorn sheep live only in the high alpine meadows and rocky ridges of the Sierra Nevada, typically above 10,000 feet elevation where snow and ice persist much of the year. The Desert Bighorn population is larger and more stable, while Sierra Nevada bighorn sheep were hunted to near extinction and now number only a few hundred individuals. Both types have the same body size and horn shape, but they have adapted to very different climates, food sources, and seasonal patterns.

Male bighorn sheep grow the most impressive horns of any North American wild sheep, and their horns are the primary way to identify them. A mature ram's horns curve outward, up, and back in a tight spiral that can complete a full circle or more. The horns are ringed with annual growth lines that you can sometimes see from a distance, and they can reach 40 inches in length and weigh 30 to 40 pounds. Younger males have shorter horns that are less tightly curled. The horn bases are dark brown or black, and the tips are often worn smooth and light colored from rubbing rocks. Desert Bighorn Sheep rams typically have slightly more massive and tighter curls than Sierra Nevada bighorn sheep, though this difference is subtle. Females (ewes) have thin, slight horns that curve upward and outward in a 'V' shape, rarely exceeding 12 inches in length.

Female bighorn sheep (ewes) are noticeably smaller and slimmer than males, weighing 75 to 150 pounds compared to a male's 100 to 200 pounds. Ewes are the same tan or brown color as males, with pale rump patches and dark backs. The most obvious difference is their horns: ewes have thin, short horns that form a gentle 'V' shape when viewed from the front, usually no longer than 12 inches. Males have the large, tightly curled rams. Both males and females have muscular bodies built for climbing steep rocky terrain, but females are more graceful in build. Ewes often lead the herds and are protective of lambs, which are born in spring and stay with their mothers for about a year.

California is home to only the Rocky Mountain bighorn sheep subspecies (Ovis canadensis canadensis), which includes both the Desert Bighorn and Sierra Nevada populations. There are no other bighorn sheep subspecies currently occurring in California. Other bighorn subspecies exist in the southwestern United States (like the Nelson's Desert Bighorn in Arizona), but California populations are genetically distinct and isolated from neighboring states. The Desert Bighorn Sheep population that ranges into California from the Mojave region is the northernmost extent of the Desert Bighorn Sheep subspecies' range. If you encounter bighorn sheep in California, they are always the same species and subspecies, just adapted to different elevations and climates.

Both types of California bighorn sheep have tawny brown or tan coats year-round, with a darker stripe running down the back and a pale white or cream-colored rump patch that is very visible when they run. Their undersides, including the inner thighs and belly, are lighter in color. The face is usually lighter than the body, sometimes with a dark nose or face markings. In winter, their coats become slightly thicker but do not change color. Unlike some mountain animals that turn white in snow, bighorn sheep remain the same brown and tan colors throughout the year, which helps them blend into rocky outcrops and talus slopes. The pale rump patch serves as a visual signal to alert other sheep when a predator is spotted, making it more visible as the sheep bounds away over rocky terrain.

Desert Bighorn Sheep are medium-sized wild sheep standing 3 to 3.5 feet tall at the shoulder and weighing 100 to 200 pounds, depending on age and sex. Adult rams are larger and more muscular, often weighing 150 to 200 pounds, while ewes typically weigh 100 to 130 pounds. Lambs are born weighing about 6 to 8 pounds and grow rapidly, reaching adult size by about 4 to 5 years old. Males continue to develop muscle mass and horn growth into their early teens. Sierra Nevada bighorn sheep are very similar in size, though some populations may average slightly smaller due to harsher alpine conditions and limited forage. A large desert ram with a massive horn can appear much bigger than a slim ewe, but the difference is mostly muscle and horn mass rather than body length.

Bighorn sheep tracks are small and rounded, about 2 to 3 inches long, with a split hoof similar to domestic sheep but smaller and more dainty. The tracks show two teardrop-shaped prints side by side, and in soft ground or snow, you may see toe marks at the front. Bighorn sheep droppings are pellet-shaped, about the size of a raisin or small marble, and are usually left in scattered piles. The droppings are often dark brown or black and crumble easily when handled. You are much more likely to see droppings than tracks, as bighorn sheep inhabit rocky terrain where their small hooves leave little mark. If you find a pile of sheep pellets near a high rocky outcrop or cliff face in the desert or Sierra Nevada mountains, it is likely from bighorn sheep. Domestic sheep droppings are larger and more densely packed.

Sierra Nevada bighorn sheep were hunted to near extinction by the early 1900s, dropping from thousands to fewer than 100 individuals by the 1990s. Disease transmission from domestic sheep herds, habitat loss, and continued hunting pressure combined to make Sierra Nevada bighorn sheep one of the rarest large mammals in North America. Today, conservation efforts including domestic sheep removal from critical habitat and careful reintroductions have increased their numbers to around 600 to 700 individuals, but they remain one of California's most endangered large animals. Desert Bighorn Sheep populations also faced severe decline, but they have recovered more successfully and now number around 4,000 to 5,000 in California and the southwestern United States. Both populations remain vulnerable to disease and environmental stress, so sightings are never guaranteed even in their preferred habitats.

No, you cannot see both types of bighorn sheep in the same area because they occupy entirely different regions of California. Desert Bighorn Sheep live in the hot, dry mountains of southern and eastern California, including the San Gabriel Mountains near Los Angeles, the San Bernardino Mountains, the Mojave National Preserve, and the Death Valley region. Sierra Nevada bighorn sheep live only in the high alpine zone of the Sierra Nevada, typically above 10,000 feet elevation, far from any desert habitat. There is no overlap between the two populations, and they have evolved separate management and conservation strategies. If you are planning to see bighorn sheep in California, you will choose one specific region and one population type based on your location and which area you can access.