Well, don't know if piney[red] squirrels count in this thread, but here in Indiana they are unregulated, and pretty much considered a pest. My buddy's woods/pond area is lousy with them. Heres 2-3 pics of ones I managed to get with my little H&R Sportster 22 LR. I won't even tell you how many I missed, except to say they are fast little boogers.
For those of you who don't know, they are about the size of those 13 sriped ground squirrels. Here in hoosierdom, we call em gophers.