Dunno, but, grouse linger more so than deer (whitetail or Mule Deer), elk, caribou, pheasants, ducks, geese, antelope, moose, coyotes, fox, weasels, doves, partridge, or rabbits. Turkeys linger like grouse, the must be related. Ruffed grouse or sharptail, doesn't matter, they linger.