White-tailed ptarmigan on snow. (GroundBird065)
White-tailed ptarmigan in summer. (GroundBird016)
White-tailed otarmigan on snow. (GroundBird063)
White-tailed ptarmigan in spring. (GroundBird062)
White-tailed ptarmigan in spring. (GroundBird015)
White-tailed ptarmigan. (GroundBird010)
White-tailed ptarmigan. (GroundBird066)
Alert willow ptarmigan. (GroundBird007)
White-tailed ptarmigan perched on a rock. (GroundBird019)
White-tailed ptarmigan in flight. (GroundBird014)
Willow ptarmigan in autumn color. (GroundBird005)
White-tailed ptarmigan on Guanella Pass, Colorado. (GroundBird083)
White-tailed ptarmigan in flight. (GroundBird012)
White-tailed ptarmigan perched on a rock. (GroundBird017)
White-tailed ptarmigan eggs. (GroundBird011)
White-tailed ptarmigan in spring. (GroundBird061)
White-tailed ptarmigan with a view. (GroundBird064)
White-tailed ptarmigan in the grass. (GroundBird067)
Pair of willow ptarmigan. (GroundBird006)
White-tailed ptarmigan camouflaged on snow. (GroundBird013)
White-tailed ptarmigan incubating eggs in nest. (GroundBird077)
White-tailed ptarmigan close-up. (GroundBird009)
White-tailed ptarmigan in spring. (GroundBird018)
White-tailed ptarmigan on a rock. (GroundBird022)
