The ptarmigan lives year-round above the tree line in the Cascades from southern British Columbia to Mt. Adams in southwest Washington. In winter, they rely on dry, fluffy snow to bury themselves and ...

Ptarmigan, because they can fly quickly, were harder to count, and were seldom seen when snow covered all the vegetation. But they seemed to move at a similar speed to the caribou, on average.

"I think it's pretty clear that [the Mount Rainier white-tailed ptarmigan is] imperiled," Greenwald says, citing shrinking glaciers, decreasing snow cover and rising treelines. In his work ...

Nature is full of colours. But, while some stand out for their plethora of colours, others are known for their lack of it.

with top honors awarded to Norwegian photographer Erlend Haarberg for his photo of a rock ptarmigan in winter plumage taking flight above snow-covered mountains. This year, the competition donated ...