I've been spending a fair amount of time up in Snohomish at my parents' place, and they have Douglas squirrels. Three by my count. OK, gray squirrels are wacky enough, but Douglas squirrels are really crazy. They're really small and very territorial. They fight all the time, even when food is abundant for all. Yeah, they're crazy, but they're also very small and cute. They're about half the size of a gray squirrel, about chipmunk-size, but they're not chipmunks.
Finally, this picture isn't mine; it's Beck's. She likes squirrels, too. She was in Denny Park recently and found this fellow wandering around. It's a shot I wish I could have taken.