I don't know I would call dillo's invasive as just expanding their range. MTB I think you went to Missouri State and if you had Robbin's Mammalogy we went over dillo's and how they are expanding their range. The people of Mexico and Central America actually use to hunt dillo's for use, not eating but other stuff. Now they are not hunted and been able to expand north without any pressure. Man if you like talking about this take a class at MO State called Biogeography.
The past three years not counting this one have been really light winters allowing dillo's to travel north. I'm sure if we get some really cold weather for an extended amount of time it will kill off the dillos up north.