What are common physical features of the male Western American grouse?

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Western American grouse include the prairie chicken, Tympanuchus cupido, once common in the East, and the sage grouse, Centrocercus urophasianus. The latter, called also sage hen, sage cock, or cock of the plains, is the largest American grouse (25-30 in./62.5-70 cm long) and so named because its flesh tastes strongly of sage—the result of feeding on sagebrush buds. The males of both these species are distinguished by yellow air sacs on the neck that inflate to an enormous size during courtship. European species include the capercaillie, the largest grouse (roughly the size of turkey), and the black grouse. The red grouse is found in Great Britain.