Sooty Grouse

The Sooty Grouse (Dendragapus fuliginosus) is a large, forest-dwelling grouse native to the mountainous and coastal coniferous forests of western North America. Formerly classified alongside the closely related Dusky Grouse as a single species known as the "Blue Grouse," the Sooty Grouse is now recognized as its own distinct species. These birds are deeply associated with old-growth and mature secondary-growth forests, where they spend much of their time high in the canopy, especially during the winter months. They are renowned for their cryptic plumage and the male's remarkable, low-frequency vocalizations that reverberate through the damp coastal woods in spring.

The Sooty Grouse is a stocky, chicken-sized bird with notable differences between the sexes.

• Males: Predominantly dark charcoal-grey or "sooty" overall. They possess a prominent yellow-to-orange comb over each eye. During courtship displays, they reveal bright yellow-orange throat air sacs (gular patches) bordered by white-based feathers. The long tail is dark with a distinct, pale grey band at the tip.
• Females: Cryptically colored with intricate mottling of brown, buff, and black, helping them blend seamlessly into the forest floor. They lack the yellow air sacs and combs of the male but share the dark, grey-banded tail.

Similar Species

• Dusky Grouse (Dendragapus obscurus): Found further inland (primarily the Rocky Mountains). Males have red-to-purplish throat air sacs (rather than yellow-orange) and their tail band is either absent or much less defined. The male's hooting is also quieter and typically has fewer syllables.
• Ruffed Grouse (Bonasa umbellus): Much smaller, with a distinct crest on the head, heavily barred underparts, and a dark band near (but not at) the tip of a rufous or grey tail.
• Spruce Grouse (Falcipennis canadensis): Smaller, with bold black-and-white patterning on the underparts and a conspicuous red comb in males.

Sooty Grouse are closely tied to coniferous forests of the Pacific Coast, ranging from southeastern Alaska and coastal British Columbia down through western Washington, Oregon, and northern California, extending inland to the Sierra Nevada.

Unlike many North American birds that migrate, the Sooty Grouse performs a reverse altitudinal migration:

• Spring and Summer: They inhabit lower-elevation forest edges, clearings, and subalpine meadows where nesting cover, deciduous vegetation, and insects are abundant.
• Winter: They move upward into dense, high-elevation coniferous forests (such as Douglas-fir, hemlock, and true fir), where they spend weeks at a time high in the canopy, feeding almost exclusively on conifer needles.

Vocalizations and Display

The most famous behavior of the Sooty Grouse is the male's spring courtship display. Perched high in a conifer or on a fallen log, the male produces a series of five to six extremely low-pitched hoots: wupt-wupt-wupt-wupt-wup. This sound is incredibly deep and carries for long distances, often sounding closer or further away than it actually is, making the bird notoriously difficult to locate. During these displays, the male struts with his tail fanned, wings drooping, and yellow throat air sacs fully inflated and exposed.

Diet and Feeding

• Winter: Specialized folivores, consuming almost nothing but the needles and buds of Douglas-fir, hemlock, fir, and pine.
• Summer: Their diet diversifies to include berries, leaves, twigs, seeds, and insects (which are crucial protein for developing chicks).

Nesting

Nests are constructed by the female on the ground, usually hidden under a log, low branch, or dense shrub. The nest is a shallow scrape lined with dry grass, needles, and feathers. A typical clutch contains 5 to 10 buff-colored eggs with brown spots. The young are highly precocial and leave the nest shortly after hatching to forage alongside the female.