Answer: A fence may keep them out, although they can climb as well as tunnel under a fence. Try using a sturdy wire mesh and bury the bottom edge of it horizontal to the ground and bent outward about a foot. Next, add a string of electric fence wire to keep them from climbing it. I would also caution you that groundhogs are very unpredictable wild animals that give terrible bites. If they are anywhere near an area where people frequent, I would strongly suggest having a professional remove them.
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