Personal anecdote about squirrels:
Some years ago, my friend bought an old house and he spent a lot of time and money over the summer refurbishing it himself, as he was a contractor by trade. He paid particular attention to the insulation because the winters are long and brutal in the Northwoods.
A few weeks after it was finished, I visited him for the afternoon and we got to playing cards at the kitchen table. It was November and it was below freezing outside.
I mentioned to him that it seemed awfully drafty where I was sitting and I asked him why the furnace kept kicking on every two minutes.
We stopped playing cards while he investigated. Sure enough, there was a definite draft of cool air that seemed to be emanating from the walls and the furnace was running way more often than it shoukd have been.
He got out his tools and began removing the wood paneling from the walls in the kitchen. After he pulled out a few boards, he started hollering "What the **** is going on here? My insulation is gone!"
He pulled more boards out from several different spots which revealed some areas with insulation, but other sections with no insulstion. He kept saying, "Am I going nuts? Did I lose my mind and forget to put insulation in some areas?"
He suddenly stopped jumping around and looked at me and said, "Nuts, eh? Wait a minute . . . "
He opened the front door and went outside. I followed.
He was looking up at the trees in his yard. He lived in the woods and he had a lot of trees. He pointed at the top of one tree and shouted, "Look right there! Do you see that?" He pointed to other trees, yelling "There, and there, and there. Look at all that!
There was pink fiberglass insulation in several of the trees. He said "Those ******* squirrels got into my walls and stole the insulation out of my house to build their nests!"
He ran back into his house and came back out with his shotgun, which he used to blast every pink nest he could see, while I stood there with my mouth hanging open.
