Lots of critters are expanding and changing their ranges. The old timers tell me that there was a time when there were few whitetail deer in southern lower Michigan, now we're overrun. I've read that possums have expanded their range north over the last couple of hundred years. Coyotes seem to be growing in numbers in this part of the state as well.
I've heard my dad talk about when a heard of deer was spotted near by, eventually the news got around by phone and there was almost a traffic jamb out in the country where they still live in Hillsdale, Michigan.
As far as the Armadillo's go, We had one killed on a city road here in Murfreesboro, Tennessee a few years ago(were in the middle of Tennessee).