There are 3 species of ptarmigan, all change to white in winter in most populations, but not all.
Almost all grouse, ptarmigan and capercaille species fit that criteria. Want to be more specific?
there is a bird called the ptarmigan which continuously changes its plumage to hide and camouflage itself. The ptarmigan is found usually in the places occurring in the Arctic Circle. To hide it from its main predator, the Arctic fox, it changes its plumage throughout the seasons. Its plumage will almost blend into a rock in the summer, when the ice would have melt, but in the winter, its plumage changes to a pure white. That's your answer.
A pingo, also called a hydrolaccolith, is a mound of earth-covered ice found in the Arctic and subarctic that can reach up to 70 metres
The feathers covering the body of a bird are typically called its plumage.
Preening
Boreals
The Arctic wolf (Canis lupus arctos), also known as the Melville Island wolf, is a subspecies of gray wolf native to the Canadian Arctic Archipelago, from Melville Island to Ellesmere Island.
A 'Shag'
Subarctic.
One of them is a plume. All of them together is plumage.
Young arctic wolves are called pups.
Parallel latitudes