Male Snow Buntings head to their high arctic breeding grounds when the ground is still covered in snow and temperatures can dip to -22° F.
The Snow Bunting places its nest deep in cracks or other cavities in rocks. Although such nest sites are relatively secure from predators, rocks are cold. The thick nest lining of fur and feathers helps keep the eggs and nestlings warm, but the female must stay on the nest for most of the incubation period.
Although breeding and nonbreeding Snow Buntings look quite different, the change from nonbreeding to breeding plumage isn't caused by growing in a new set of feathers (molt). The change from brownish to pure white happens when males rub their bellies and heads on the snow, wearing down the brown feather tips to reveal immaculate white features below. Cornell All About Birds
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