Location in Oregon
Blue is Winter range - Red is Summer range
Purple is Year-round range - Yellow is Migration range

Snowy Owl

Nyctea scandiaca - A diurnal arctic owl that winters irregularly in the U.S. Most adult birds are almost pure white. Immatures, which are darker, go farther south than adults in winter. The large size, pale plumage, and lack of ear tufts are diagnostic. It perches near the ground in open country and often allows birders to approach closely. Silent south of its breeding grounds.