Time to bust some myths.
They are the only critters known to man (other than mankind) that can carry leprosy!
Untrue. Mice can carry leprosy as well.
http://encarta.msn.com/encyclopedia_761578788/leprosy.html
Funny thing is, there is no record of leprosy in the New World before European conquest. So if anything, invading Old Worlders gave leprosy to the 'dillos, who carry it, but are not affected by it.
http://books.google.com/books?id=j1...paVugNE&sig=0etmJHcpyskMb-owW2oYQEW2Weo&hl=en
If it wasn't for that armor they could never survive- they're loud, slow (relatively), they're blind and deaf as far as I can tell, and aren't very predator-savvy in the least.
While 'dillos have relatively poor eyesight, their hearing is good enough. They are predator savvy in terms of being as savvy as they need to be. With armor, they don't have to be terribly fearful of many critters. Just like most game, they don't understand rifles. Hell, most humans don't either, however. Simply put, armadillos have few natural pretators in North America.
So sure, without their armor, they would not survive. It is their advantage. Without claws and big teeth, would bears and mountain lions survive? All animals have an adaptation or adaptations to give them advantages. For humans, we are pretty much soft underbelly all over. We have good sight, moderate hearing, poor sense of smell, no armor, no real fur, no claws, no big canines, and we are awfully slow with bipedalism. Our big advantage is culture. Without culture, we are nothing but prey.
I've been told they're migrating north due to global warming. I'm hoping if I can shoot a few and drive them back to Texas where they belong I can effectively reverse global warming.
No, they are not migrating as a result of global warming. Their migration has been natural and cultural and has been traced back into the 1800s. They didn't cross the Rio Grande until around 1870s-1900 (as I recall, and where they stayed for a few years) and then spread across Texas which was well mapped.
In 1922, they started turning up in Florida with no connecting reports between Texas and Florida. Either they came overland in trucks or entered via seaports and shipping. They didn't show up in Louisiana until 1925.
Pretty much the warm months are fine for armadillos anywhere in the lower 48. The question is then one of surviving the winters. Humans create a lot of micro habitats that are great for armadillos to survive in northern clines such as cellars, barns, abandoned buildings, etc. They can burrow under a house and be quite happy even in fairly cold climates. They don't do as well there, but they can survive. The house radiates heat to help keep the ground warm and the 'dillos stay happy. No, global warming isn't why the armadillos have come north anymore than it was the reason they moved into Texas in the first place from Mexico.
Simply put, the temps haven't changed enough in the last 200 years to matter. Animals sometimes do spread for a variety of reason and the armadillo is one of those animals.