The nine-banded armadillo invasion of Missouri is over. Armadillos have now been found near the Missouri-Iowa border and in the St. Louis metro area they are now almost as common roadkill as are racoons. I find these animals fascinating and Sarah and I once kept one as a pet for a brief time. Casey and I found several armadillos digging up plant bulbs in the fields of Peck Ranch while looking for elk last winter.
There are all sorts of interesting bits of information that can be shared about these guys. Here are a couple of my favorites. 1) Twenty five years ago you would not find armadillos anywhere in the state. 2) The armadillo is the only other known animal, besides humans, to carry the disease leprosy. These two factoids are related because they likely have the same underlying cause behind them – the lower body temperature of armadillos. Armadillos have a lower working body temperature than most mammals, maintaining it at about 89 °F. The increasingly warmer winters over the past few decades has allowed the armadillo to get through the previously limiting winters, allowing their northward expansion. Their lower body temperature also allows them to be carriers of the bacteria (Mycobacterium leprae) known to cause leprosy. This bacteria thrives in tissues of lower temperatures, such as the tips of our noses and fingers and within the armadillo.