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Which features distinguish grouse from other galliform birds?

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A peacock stands with its vibrant green and blue tail feathers fully fanned out in display, showing eye-like patterns across the plumage. — Galliform Blue, or Indian, peacock (*Pavo cristatus*) displaying its resplendent feathers.

Grouse (family Tetraonidae) are distinguished from other members of the order Galliformes by several specific physical characteristics. The most notable features include:

Feathered extremities: Unlike other galliforms, such as the Phasianidae (which includes chickens and pheasants), grouse have lower legs (tarsi) and nostrils that are at least partially covered in feathers.1
Facial ornamentation: Many species possess brightly colored patches of bare skin located over their eyes.1
Tail structure: Grouse typically possess strong tails, which are ornamental in several species.1

While all galliforms share a general body plan adapted for terrestrial life, these specific plumage and anatomical traits help differentiate the Tetraonidae family from their relatives. Additionally, many grouse are noted for their complex social displays, often gathering in specialized areas known as leks to perform courtship rituals, a behavior that varies in degree across the order.123