Willow Ptarmigan -- feeding on willow, no less (first photo).
Males were in their courtship plumage, red-brown head and white body.
Females had fully molted into their summer brown.
Returning in the snow from a successful (but photoless) trek
to find a Bristle-thighed Curlew, we found this American Golden-Plover
who must have had a nest nearby considering how it stood its ground.
You can see how effective its camouflage would be if it put its head down.