Keywords: Nebraska, Tympanuchus phasianellus, Valentine National Wildlife Refuge, air, air sacs, bird, birds, blind, dark, display, displays, ecology, grassland, grasslands, great, great plains, ground, grounds, grouse, inflate, lek, male, mate, mating, movement, plains, prairie, ritual, sac, sacs, sharp-tailed grouse, shutter, slow, speed, spring, wildlife