What is the sharp-tailed grouse of the great plains and Rocky Mountains (Pediocætes phasianellus); -- called also pintailed grouse, pintailed chicken, springtail, and sharptail called?

pintail — (Zoöl.) The sharp-tailed grouse of the great plains and Rocky Mountains (Pediocætes phasianellus); -- called also pintailed grouse, pintailed chicken, springtail, and sharptail. (Webster's 1913.)