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If they find a hospitable spot with shelter, water, and a steady food source, there’s a good chance groundhogs will return—or not leave at all.

This depends on if their needs are being met. They'll likely return night after night if they have access to food, water, and adequate shelter. If this changes, they’ll look for another roosting spot. This is why bright lights and other dissuading factors often work when removing bats from a property.

The best deterrents for possums include securing trash cans with tight-fitting lids, removing outdoor food sources like pet food or fallen fruit, and trimming tree branches that provide access to your roof or an open window. Motion-activated lights or sprinklers can also startle and discourage them from visiting. Additionally, you can take advantage of their strong sense of smell by using garlic, onion, or commercial possum repellents to keep them off your property.

Identifying the specific animal running on your roof at night can be challenging without direct observation. Common nocturnal roof visitors include raccoons, squirrels, opossums, and rats. Raccoons are bigger and can create heavy thumping sounds. Squirrels are agile and may produce rapid scurrying noises. Opossums tend to move stealthily with less noise. Rats can make scratching or gnawing sounds. To determine the culprit, look for signs like footprints, droppings, or damaged areas near the roof. For accurate identification, consult a pest control professional or set up wildlife cameras near potential entry points.