Wondering how squirrels make it in the cold and snow

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I've been sitting here watching the squirrels in my yard through my office window. Or maybe I should say "squirrel" since I've only seen one. Normally, there are several of them running around chasing one another or digging in the ground. But not now. It's too cold! This morning it was -2 degrees F. Yesterday it was not quite as cold, but the wind was really whipping. I know squirrels are covered in fur, but I think that even if I had on two fur coats, I still would have been freezing. With the ground too frozen to dig into, and the temperature way below freezing, I think that squirrel must be really hungry to be outside looking for food on a day like this. Or maybe it's just one of those guys that are determined to get out and get their exercise in no matter what the weather is. Image credit: George Chriss via Wikimedia (CC BY-SA 3.0)