Snow Bunting
Plectrophenax nivalis

f22 @ 1/800s, ISO:800, Nikon D300S w 300mm

"Snow Bunting," Wikipedia, the free encyclopedia. It is fairly large and long-winged for a bunting, 1518 cm long and with a wingspan of 3238 cm, and weighing 2650 g. In flight, it is easily identified by its large white wing patches. The breeding male is unmistakable, with all white plumage and a black back.
Cambridge Bay, Nunavut, Canada