Sooty Grouse

Identification

The sooty grouse is a medium-sized forest grouse, averaging 40–50 cm in length and weighing 750–1,300 g. Both sexes display a distinctive long, square tail with light gray at the tip. Males are strikingly dark overall, with a bold yellow throat air sac surrounded by white plumage, and a yellow wattle above the eye that becomes prominent during display. Females are considerably different in appearance, with mottled brown plumage adorned with dark brown and white marks on the underparts. Females also have noticeably longer and skinnier necks compared to males, while males possess stouter, more robust bodies.

Range & Habitat

The sooty grouse is native to North America's Pacific Coast Ranges, occurring from southeastern Alaska and Yukon south to California. These forest-dwelling birds favour the edges of conifer and mixed forests in mountainous regions, with their distribution closely tied to various conifer species. They thrive in old-growth forests where diverse plants and trees provide essential resources. The species also inhabits regenerated logged or burned areas, provided sufficient bushes and shrubs are available for nesting. Grouse Mountain in Vancouver, Canada owes its name to the historical significance and large populations of these birds found there.

Behaviour & Diet

Sooty grouse are permanent residents that exhibit an unusual migration pattern, moving short distances by foot and brief flights to denser forest areas in winter—notably shifting to higher altitudes rather than lower elevations. Males attract females through distinctive deep hooting calls, described as resembling someone striking a deep but quiet drum, typically delivered from high in the trees, accompanied by short flapping flights. Females build ground nests in shallow scrapes concealed beneath shrubs or logs, laying 5 to 10 well-camouflaged eggs with creamy bases and brown speckles.

Their diet varies seasonally. In winter, these birds forage both on the ground and in trees, subsisting primarily on fir and douglas-fir needles, with occasional hemlock and pine needles—they can survive on fir needles alone if necessary. Summer diet includes green plants, berries, and insects, particularly ants, beetles, and grasshoppers. Spring brings a shift toward berries, leaves, and flowers. Chicks depend almost entirely on insects for their first ten days of life. Like many birds, sooty grouse consume grit and small stones to aid food digestion in their gizzard.

Best Time & Places to See It

Spring is an excellent time to observe sooty grouse, particularly when males are actively displaying and calling to establish territories. Look for them in old-growth conifer forests and mixed woodlands throughout the Pacific Coast Ranges from Alaska to California. Grouse Mountain near Vancouver remains a reliable location with established populations. In winter, birds move into denser coniferous forests at higher elevations, making them slightly more challenging to locate but potentially more concentrated in specific areas.

Photography Tips

Spring offers the best photographic opportunities, when males are visible and vocal during breeding displays. Position yourself near conifer stands at dawn or dusk when grouse are most active. The striking contrast between males' dark plumage and yellow throat patches and eye wattles provides excellent subject material. Female photography requires patience, as their cryptic mottled plumage makes them harder to spot in forest settings. A telephoto lens is essential for approaching these wary forest birds without disturbance. Listen for the distinctive deep hooting calls to locate males in their territories.