What is causing holes in my yard not like mole mounds?

Ska29524273
by Ska29524273
Take a step on the grass do not see a hole but feel the ground sinking in and overtime gets deeper more visible. Usually 4 to 6 holes within the area of 4 ft width and 6ft length. Once holes deeper the grass goes they look more like a tunnel then straight down holes. I do have possums who come in my yard at night.

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