Thanks, everyone, for the replies & kind words.
I think you have more work on your hands. You forgot White-tailed Ptarmigan.
Well, I didn't forget about them, I just don't think of them as a grouse because the are not called "grouse" by name. Someday maybe I will set out to photograph all 3 of North America's Ptarmigan species!
By the way, I have photographed White-tailed Ptarmigan, but so far I have not done so here in WA. Maybe later this year? Here is one from Montana last fall - it was starting to turn from brown to white.