The Snowy Owl, Bubo Scandiacus, is a large, white owl of the typical owl family. Snowy owls are native to Arctic regions in North America and Eurasia. Younger snowy owls start with a darker plumage, which turns lighter as they get older.
Since the it has been considered politically incorrect to call a black cat a black panther. The big black cats are black leopards or black jaguars and are not referred to as black panthers by anyone who knows anything about big cats.