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.

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    $\begingroup$ I recommend you read this. -- "Armadillos do not tend to move from the area they are born in unless the population is high. A larger population resulted in an increased density of animals, prompting emigration and subsequent expansion of range." $\endgroup$ – user22020 Aug 23 '17 at 16:40
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    $\begingroup$ To get to the other side? Sorry, it was just too inviting. $\endgroup$ – anongoodnurse Aug 24 '17 at 0:06

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