The Eurasian Eagle-Owl is a very large, powerful bird, smaller than the Golden Eagle but larger than the Snowy Owl. It's often called the world's largest owl, tho the Blakiston's Fish Owl is slightly heavier and the Great Grey Owl is slightly longer.
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.