I don't know a great deal about squirrels, and most of what I do know is as a result of watching Sam chase them. He's spent a busy afternoon stalking them around the back yard. I am convinced that they laugh behind their paws as they scamper toward acorns and away from him.
Lots of squirrels live in the neighborhood trees - I haven't personally counted all of them, though I'm sure Sam has. Most are ordinary looking, but one is unusually small, not much bigger than a mouse. For a long time I thought I must be imagining, that it was just a chipmunk with long fur. Following further conversation with neighbors, I've learned that several of us have seen it and all assumed that we were hallucinating, etc. Right now it's perched outside my window, staring at me (and, presumably, Sam) in a manner best descrbed as saucy.
At least I know it's for real!