I would say it's very likely an Armadillo. We are on a preserve as well and have the same issue every few years. We've tried most everything and the only thing that has worked has been to take a big ceramic floor tile and lay it over the hole and leave it for a couple of weeks. You'll periodically see scratch marks around it where they try to get back in but when that fails they move on. Unfortunately, they usually move on to another part of your yard but do it again. Eventually, they will move on.
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