Phasianidae consists of the pheasants and their allies; the grouse are sometimes considered to make up a separate family, the Tetraonidae.
2.
Grouse, ptarmigans, and prairie chickens are all chicken-like birds with short, curved, strong bills, part of the family Tetraonidae.
3.
The "'Cantabrian capercaillie "'( " Tetrao urogallus cantabricus " ) is a subspecies of the western capercaillie in the grouse family Tetraonidae.
4.
Grouse are frequently assigned to the subfamily "'Tetraoninae "'( sometimes Tetraonidae ), a classification supported by mitochondrial DNA sequence studies, and applied by the American Ornithologists'Union, ITIS, and others.
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