Greater Sage-Grouse

The Greater Sage-Grouse (Centrocercus urophasianus) is a flagship species of the western North American sagebrush steppe. As the largest grouse on the continent, this iconic bird is renowned for its spectacular spring lekking displays. Once numbering in the millions, their population has significantly declined due to habitat loss and fragmentation, making them a high-profile focus of wildlife conservation efforts across the American West.

Adults are large, round-bodied birds with long, pointed tails.

Males: Easily distinguished by their massive size, dark gray-brown barred plumage, black belly, and white breast. During spring displays, males reveal bright yellow-green inflating air sacs on their chests, draped in white ruffs, and contrastingly long, spiky tail feathers fanned out in a dramatic starburst pattern. They also feature yellow comb patches over each eye.

Females: Significantly smaller than males and cryptically colored in mottled gray, brown, and white to facilitate nesting camouflage. They lack the white breast ruff and yellow air sacs of the male but share the diagnostic black belly patch.

Similar Species: The Gunnison Sage-Grouse (Centrocercus minimus) is visually similar but about a third smaller, with distinct white striping on its tail feathers and unique filoplumes on the male's neck; its range is restricted to southwestern Colorado and southeastern Utah.

As obligate sagebrush mutualists, Greater Sage-Grouse are entirely restricted to vast, open sagebrush-dominated steppes of western North America. Their range spans parts of 11 US states (from eastern Washington and Oregon to the Dakotas and south to Colorado) and two Canadian provinces (Alberta and Saskatchewan). They are largely non-migratory but may make local seasonal movements to find suitable wintering grounds where sagebrush remains tall and exposed above the snow cover.

Dieting & Feeding: Uniquely adapted to digest tough sagebrush leaves, which make up nearly 100% of their winter diet. Unlike other gallinaceous birds, they lack a muscular gizzard for grinding seeds, relying entirely on soft vegetation and summer insects (especially for young chicks).

Courtship & Breeding: In spring (typically March to May), males gather in open areas called leks at dawn. They perform complex, highly synchronized displays: strutting, fanning their tails, and inflating/deflating air sacs with a loud, liquid popping sound to attract females. Females visit these leks to select a mate before nesting on the ground beneath protective sagebrush cover.

Vocalizations: Males make soft cooing notes and loud, resonant popping and whistling sounds during displays. Females communicate with cackling and clucking calls to maintain contact with their broods.