Arizona Desert Bighorn Sheep Facts & Wildlife Guide
Reviewed and updated by AZ Leisure Staff Writers on .
Desert bighorn sheep are among Arizona's most impressive native mammals, adapted to survive in steep, rocky mountains and some of the state's hottest desert landscapes. Powerful legs, specialized hooves and exceptional balance allow them to move across cliffs and rugged canyon walls where predators have difficulty following. Arizona desert bighorn occur primarily in western and southern mountain ranges, where wildlife watchers may see rams, ewes and lambs moving between rocky escape terrain, feeding areas and desert water sources.
- Bighorn Sheep Facts
- Habitat & Range
- Desert Adaptations
- Behavior & Reproduction
- Diet & Water
- Where To See Bighorn Sheep
- Conservation
- FAQ
Arizona Desert Bighorn Sheep Facts
- Scientific Group: Ovis canadensis, with desert bighorn populations represented by desert-adapted subspecies.
- Male: Ram.
- Female: Ewe.
- Young: Lamb.
- Ram Weight: Large Arizona bighorn rams may weigh up to about 250 pounds.
- Horns: Rams develop massive curling horns, while ewe horns are considerably shorter and only slightly curved.
- Habitat: Rugged desert mountain ranges, cliffs, rocky slopes, canyons and nearby open feeding areas.
- Major Predator: Mountain lions are an important natural predator of bighorn sheep.
Desert Bighorn Sheep Habitat & Range In Arizona
Desert bighorn sheep favor rugged mountain terrain where steep cliffs, rocky slopes and broken canyon walls provide escape cover from predators. They also use nearby open slopes, washes and desert basins for feeding and travel. Suitable habitat occurs across much of western and southern Arizona in both Mojave and Sonoran Desert mountain ranges.
The Black Mountains of northwestern Arizona support the state's largest contiguous desert bighorn population, while important herds also occur in the Kofa Mountains, Grand Canyon region, central Arizona mountain ranges and other rugged desert landscapes.
How Desert Bighorn Sheep Survive In Arizona
Desert bighorn sheep are exceptionally well adapted to rocky, arid environments. Their split hooves have hard outer edges and softer, flexible centers that provide traction on uneven rock. Strong legs and excellent balance allow them to climb steep slopes and move rapidly across narrow ledges where predators have difficulty following.
They are also adapted to cope with limited water. During periods when green vegetation contains sufficient moisture, bighorn may go for extended periods without drinking. During hotter and drier conditions they depend more heavily on springs, pools, natural rock basins and other reliable water sources.
Desert Bighorn Sheep Horns
Both male and female bighorn sheep have permanent horns that continue growing throughout life. Mature rams develop the species' characteristic massive curled horns, while ewes have shorter, more slender horns with much less curvature.
During the breeding season, competing rams use their horns in dramatic head-to-head clashes to establish dominance. The horn core contains chambers that reduce weight while allowing the horns and skull to withstand substantial force.
Bighorn Sheep Behavior & Reproduction
Desert bighorn sheep are social animals. Ewes and young commonly travel together, while mature rams may form separate bachelor groups outside the breeding season. Herd size varies with habitat, water availability and time of year.
The breeding season, or rut, generally occurs from July through October. During this period mature rams compete for access to ewes, sometimes charging head-on and striking their horns together. After a gestation of roughly six months, ewes generally give birth to a single lamb in protected rocky terrain. Lambs are able to stand and follow their mothers soon after birth.
What Desert Bighorn Sheep Eat
Desert bighorn sheep are herbivores that eat a wide variety of grasses, shrubs, herbs and desert plants. Green grasses are preferred when available, but during dry periods bighorn shift to other vegetation, including shrubs and cactus. The exact diet changes with season, rainfall, elevation and the plants available within each mountain range.
Moist vegetation can provide part of their water needs, but dependable springs, natural rock pools and wildlife water developments are important in many desert ranges, particularly during extended hot and dry periods.
Best Places To See Desert Bighorn Sheep In Arizona
- Black Mountains: Northwestern Arizona supports the state's largest contiguous desert bighorn population in rugged mountains extending south from the Hoover Dam region.
- Canyon Lake: The steep canyon walls around Canyon Lake east of Phoenix support large desert bighorn rams and provide excellent viewing opportunities from the water.
- Kofa National Wildlife Refuge: The Kofa Mountains west of Phoenix protect important desert bighorn habitat and sheep may be seen year-round.
- Grand Canyon: Desert bighorn live throughout rugged canyon terrain, including areas along the Colorado River and inner canyon.
- Gila Box: Bighorn sheep are commonly spotted among the cliffs of the Gila Box Riparian National Conservation Area in southeastern Arizona.
Bighorn Sheep Viewing Tips
- Scan rocky slopes, ridgelines and cliff ledges with binoculars rather than looking only near roads.
- Watch areas near water during hot, dry periods, particularly early or late in the day.
- Use binoculars or a telephoto lens instead of approaching sheep for photographs.
- Never feed, chase or block the travel route of wild bighorn sheep.
- Keep dogs controlled and give sheep plenty of room to move away.
- Avoid disturbing ewes and lambs in steep nursery habitat.
Desert Bighorn Sheep Conservation In Arizona
North American bighorn sheep declined dramatically during the 1800s as livestock competition, habitat impacts and diseases associated with domestic animals affected wild herds. Arizona has spent decades protecting habitat, monitoring populations, developing water sources and relocating sheep to suitable mountain ranges where populations had disappeared or become too small.
Arizona Game and Fish currently estimates approximately 6,000 bighorn sheep statewide, including both desert and Rocky Mountain populations. Desert bighorn remain an important conservation priority because individual herds can be isolated by highways, development and broad desert valleys separating mountain ranges.
How Many Bighorn Sheep Live In Arizona?
Arizona Game and Fish currently estimates the state's combined desert and Rocky Mountain bighorn population at approximately 6,000 animals. Across North America, desert bighorn populations are estimated at about 20,000. Population numbers can change as herds grow, decline, move or are supplemented through wildlife-management projects, so these figures should be treated as estimates rather than exact counts.
Arizona Desert Bighorn Sheep FAQ
Where do desert bighorn sheep live in Arizona?
Desert bighorn sheep inhabit rugged desert mountain ranges, rocky slopes and canyon country primarily in western and southern Arizona.
How big do desert bighorn sheep get?
Large adult rams can weigh around 250 pounds, while ewes are considerably smaller. Rams also develop much larger and more strongly curled horns.
What do desert bighorn sheep eat?
They eat grasses, herbs, shrubs, cactus and other desert vegetation. Their diet changes according to season, rainfall and the plants available in each habitat.
Do desert bighorn sheep need to drink water?
Yes, although they can obtain significant moisture from green vegetation during favorable conditions. During hot and dry periods they depend more heavily on springs, natural pools and other water sources.
When is bighorn sheep breeding season?
The desert bighorn breeding season, or rut, generally occurs from July through October.
Where is the best place to see desert bighorn sheep in Arizona?
The Black Mountains, Canyon Lake, Kofa National Wildlife Refuge, Grand Canyon and Gila Box are among Arizona's better-known desert bighorn habitats.
How many bighorn sheep live in Arizona?
Arizona Game and Fish currently estimates approximately 6,000 bighorn sheep statewide, including both desert and Rocky Mountain populations.
Are desert bighorn sheep endangered?
Arizona's desert bighorn sheep are managed as an important native wildlife resource rather than being listed statewide as endangered. Individual populations are closely monitored because disease, drought, habitat fragmentation and isolation can affect herd health.
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