In the early nineties I lived around Birmingham and you wouldn't see them till you traveled south of Birmingham, in the ten yrs I lived there you started to see them way north of there, then I moved back to central MO and the only time you would see them on the road is when you traveled to South MO, then later in yrs all the way to right at Jefferson City, then in the recent yrs they have made it across the river and you are seeing them in the Columbia area, a neighbor had them tear up his potted plants just up the road, couldn't figure out wth was doing it till he set up a camera.
I was hoping the cold snap we had mighta froze a good number of them but the destruction I seen at my neighbors this morning was very much looking like armordildo work,, looked like a thirty lb pig been rooting in the leaves all over the place.