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.
How is that this owl is living in the snow? The owl has adopted to its environment. Nature found a way to make it work. We tend to find ways to go against nature. Let's get back to being one with nature.