Mammals Active during the day

Thinhorn Sheep

Ovis dalli

iNaturalist Wikipedia

The undisputed masters of the northern crags, Thinhorn Sheep navigate vertical wilderness with breathtaking ease. Whether pure white or charcoal grey, these iconic rams are the crowning jewel of the subarctic mountains.

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Quick Identification

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Size

1.3-1.8 m (4.3-5.9 ft) long; 46-110 kg (100-240 lbs)

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Colors

Dall subspecies are pure white year-round; Stone subspecies range from charcoal grey to dark brown with white rumps and bellies.

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Key Features

Massive, yellowish-brown curling horns on rams
Slim, slightly curved horns on ewes
Pure white or dark grey-brown coat
Stocky, muscular build for climbing
Distinctive white rump patches on darker individuals

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 6-10 AM, 4-8 PM

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Season June-September

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Diet Herbivorous grazers eating grasses, sedges, lichens, and mosses; they also browse on willow and dwarf birch in winter.

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Habitat Alpine meadows, treeless ridges, and steep, rocky 'escape terrain' cliffs.

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Where Does the Thinhorn Sheep Live?

Native to the rugged wilderness of northwestern North America, the Thinhorn Sheep is a true icon of the subarctic peaks. Their core range extends across the vast mountain chains of Alaska and the Yukon Territory, reaching eastward into the Northwest Territories and southward into the northern half of British Columbia. These hardy survivors are masters of the high country, sticking primarily to the Brooks Range, the Alaska Range, and the Mackenzie Mountains where the air is thin and the slopes are steep.

Basemap © OpenStreetMap contributors

2 Countries

1.5M km² Range

Least Concern Conservation

US United States CA Canada

Elevation range

0 m1,000 m2,000 m4,000 m

600 m – 2,500 m

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iNaturalist / Verified observation data

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Behavior

Thinhorn Sheep are the ultimate high-altitude specialists, defined by their remarkable agility on nearly vertical rock faces. They are highly social but generally live in sex-segregated bands for most of the year. Rams form bachelor groups where dominance is established not just by age, but through dramatic horn-clashing contests, particularly during the autumn rut. These social hierarchies help reduce actual physical injury by establishing clear 'rank' through posturing and ritualized displays.

Ewes and their lambs congregate in separate nursery herds, relying on 'escape terrain'—steep, rugged cliffs—to stay safe from predators like wolves, bears, and golden eagles. Unlike many other mountain mammals, Thinhorn Sheep have incredible eyesight and prefer open alpine ridges where they can spot threats from miles away. They are wary of human encroachment and will quickly retreat to higher ground if they feel pressured, though they can become accustomed to predictable human presence near established trails.

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Camera Tips

Capturing Thinhorn Sheep requires a strategic approach to altitude and terrain. If you are lucky enough to live near their alpine habitat, place your camera on prominent ridgelines or 'saddles'—the low points between two peaks—as these are the primary highways sheep use to travel between grazing areas. Look for well-worn game trails that hug the edges of cliffs; sheep rarely venture more than a few hundred yards from the safety of rocky escape terrain.

Natural mineral licks are the absolute goldmine for camera placement. In the early summer (May and June), Thinhorn Sheep are desperate for minerals like calcium and magnesium to support horn growth and milk production. A camera aimed at a known lick can capture entire herds in a single frame. Because these areas are often exposed to extreme winds, ensure your camera is mounted to a sturdy rock or a low-profile heavy-duty stake rather than a flimsy sapling that will trigger false motions.

Regarding settings, Thinhorn Sheep are most active during the 'golden hours' of dawn and dusk. Use a high-quality camera with a fast trigger speed (0.3 seconds or less) and set a short 're-trigger' interval. Because their white coats (in the case of Dall sheep) can easily blow out in bright mountain sun, consider underexposing your daytime settings by one stop if your camera allows. In the winter, lithium batteries are non-negotiable, as alkaline sets will fail instantly in the sub-zero temperatures of the sheep's northern range.

Similar Species

Species that look similar or are commonly confused with Thinhorn Sheep.

Bighorn Sheep

Found further south; has much thicker, darker horns and a brown coat compared to the thin horns and white/grey coat of the Thinhorn.

Mountain Goat

Features thin, black dagger-like horns and a 'beard' of fur under the chin, whereas Thinhorn rams have large spiraling horns.

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Frequently Asked Questions

Thinhorn Sheep are diurnal, meaning they are active during the day. They exhibit peak activity in the early morning and late afternoon when they move from rocky sleeping ledges to alpine meadows to graze.

Unless you live in a remote cabin in the high mountains of Alaska or the Yukon, you likely won't see them in a typical backyard. They avoid human settlements and prefer high-altitude mineral licks. They should never be fed by humans.

Their diet consists mainly of mountain grasses and sedges during the summer. In winter, when food is scarce, they use their hooves to dig through snow for frozen lichens, mosses, and woody shrubs like willow.

No, Thinhorn Sheep are wilderness specialists. They require specific alpine ecosystems and steep cliffs to escape predators and are almost never found near suburban or developed areas.

Thinhorn Sheep have much more slender, flaring horns compared to the thick, tight curls of Bighorn Sheep. Additionally, Dall sheep are pure white, whereas Bighorns are always brown.

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