Dusky Grouse

The Dusky Grouse is a hardy, heavy-bodied bird of the interior mountainous regions of western North America. For many years, it was classified together with the coastal Sooty Grouse under the singular name 'Blue Grouse.' However, differences in genetics, vocalizations, and physical appearance led to their separation into two distinct species. Adapted to high altitudes, the Dusky Grouse spends its summers in open montane forests and shrubby meadows, while retreating to dense, high-elevation subalpine conifer stands to weather the harsh winter months.

Dusky Grouse are large, chicken-like birds with long, square-tipped tails.

• Males are overall dark slate-gray to charcoal. They feature a pale gray band at the tip of the tail (which is much narrower and less distinct than that of the Sooty Grouse, or sometimes entirely absent). During spring displays, they reveal purplish-red or magenta-tinged air sacs (gular patches) on the sides of the neck, bordered by white feathers, along with yellow-to-orange combs above each eye.
• Females are highly camouflaged with mottled brown, gray, and black plumage, which helps them blend seamlessly into the forest floor.
• Similar Species:
  • Sooty Grouse: Very similar, but has yellow-orange air sacs, a louder, 6-syllable call, a broader, lighter gray tail band, and is found in coastal ranges.
  • Spruce Grouse: Smaller with bold black-and-white barring on the underparts and a chestnut-tipped tail.
  • Ruffed Grouse: Features a rich, variegated brown or gray pattern, a prominent black band near the tip of its tail, and a distinctive crest.

The Dusky Grouse is resident in the Rocky Mountains and Great Basin ranges, extending from the Yukon Territory and Northwest Territories south through British Columbia, Alberta, Idaho, Montana, Colorado, Utah, Nevada, Arizona, and New Mexico.

They exhibit a fascinating altitudinal migration pattern that is opposite to most birds. In spring and summer, they reside at lower elevations (around 1,500 to 2,500 meters) in mixed forests, aspen groves, and edge habitats where they breed. When winter approaches, they migrate upward into dense, subalpine coniferous forests (up to 3,500 meters) dominated by Douglas-fir, subalpine fir, and pine, where they spend the coldest months roosting high in evergreen trees.

Dusky Grouse are often described as exceptionally tame, sometimes allowing observers to approach quite closely before walking away or flushing with a sudden, loud burst of wingbeats.

• Vocalizations & Courtship: During spring, males perform courtship displays on the ground or on low perches. They strut with their tails fanned and tilted forward, wings drooped, and neck feathers flared to expose their colorful gular sacs. They emit a quiet, deep, low-frequency hooting ('wump-wump-wump-wump-wump') consisting of 5 notes. This call is difficult for humans to locate and does not carry as far as the booming of the Sooty Grouse.
• Feeding: In summer, their diet is varied, including leaves, flowers, seeds, berries (such as huckleberry and serviceberry), and a significant number of insects (especially for developing chicks). In winter, their diet shifts almost exclusively to the needles and buds of conifers, particularly Douglas-fir and hemlock trees.
• Nesting: The female scrapes a shallow depression on the ground, usually hidden under a log, bush, or low-hanging conifer branch, lining it with pine needles, leaves, and grass.