Armadillos evolved in South America. When the continent was joined with North America, one species - the nine-banded armadillo - spread north into Middle America.
Apparently, the armadillo reached Texas about a century ago. Does anyone know why the armadillo's range continued to move northward? Maybe it's just part of a natural process following the retreat of the Ice Age glaciers, but I wondered if human impact on the environment might have something to do with it.