Dusky GrouseDendragapus obscurus
15 1/2 -21" (39-53 cm). A large grouse. Male dusky gray or bluish gray, with orange-yellow or red comb over eye, patch of reddish or purplish skin on neck surrounded by rosette of white feathers, some mottling on wings, and blackish tail with pale gray terminal band. Birds in Rockies lack terminal tail band. Females and immatures mottled brown with dark tail. Paler than closely related Sooty Grouse.