The Gunnison Sage-Grouse, found only in Colorado, was recently (in 2000) realized to be a species separate from the Greater Sage-Grouse.
They are about one-third smaller than the typical sage grouse, and males have more distinct, white tail feathers and hair feathers, filoplume. Females are about one-third smaller than other sage-grouse. The Gunnison Sage-grouse depend on sagebrush.
Male Gunnison Sage-grouse perform an elaborate display to attract females. They will strut, flap their wings against their white pouches and utter a distinctive series of sounds by vocalizing and popping two air sacs within their pouches.
