Our winter survival skills often involve staying indoors with plenty of blankets, cocoa, and mindless TV at the ready. But wild animals don't have that luxury - they have to tough it out in the cold.
Some species pile on the layers, like the Arctic musk ox, whose soft undercoat insulates them from -50 degree Fahrenheit temperatures. Polar bears have an extra layer of fat to keep toasty. Others grow thicker fur in the fall, like white-tailed deer, and some even grow lighter coats to blend into the snow.