Answer: Raccoons, skunks, oppossums and even armadillos are common in your gardening region so I can only venture a guess that it is one of those critters. Most dig in search of grubs and other insects so you might consider them as free pest control agents. Laying hardware cloth or chicken wire over the soil surface and anchoring it down firmly will keep them from digging near the foundation of your house. Best wishes with your landscape!
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