From Paul Bannick

Snowy Owl (Bubo scandiacus)

A female Snowy Owl arrives at her nest to warm her young on her nest on the tree-less Arctic tundra. Our only white owl is our heaviest (up to 6.5lbs/2950grams), breeds and winters further north and has one of the most poorly understood movement patterns.

Some of these Arctic owls winter on Arctic ice, others on territories on the tundra and some migrate to the northern Great Plains, Great Lakes, while others (especially young) irrupt or migrate into the northeastern and even the Pacific Northwestern states.