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165 PRAIRIE CHICKEN
Greater Prairie Chicken display, booming grounds. Burchard Lake Wildlife Management Area, Pawnee County, Nebraska. As part of an elaborate courtship disply, male greater prairie chickens expand the air sacs on the sides of their necks, drum their feet in stylized dances and make a booming call that can be heard for over a mile. These mating rituals occur on elevated, grazed areas in grasslands known as "leks" or "booming grounds." Once inhabiting the wide plains of the central United States, the greater prairie chicken has fared poorly as its grassland habitat has been converted to other uses.