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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.

As a general rule, if you hear an animal in your attic, don’t assume it will stay there. Animals are drawn to warmth and food sources, which could lead them to other parts of your house. In particular, it’s likely that small pests such as rats and mice that only need tiny gaps to squeeze through will end up in your walls and ductwork. Larger animals like raccoons may be limited to an enclosed attic.

Skunks like to forage for grubs in the soil, like worms and insects, but they are also tempted by trash and pet food bowls, so keeping these items out of sight may help keep skunks away. Skunks also like to set up a den in dark places, such as a crawl space or outbuilding.

Some suggest mothballs as a deterrent for iguanas, but they are ineffective and harmful. Mothballs contain chemicals like naphthalene or paradichlorobenzene, which are toxic to humans and animals, including iguanas. The fumes can cause respiratory problems, skin irritation, and other health issues. Moreover, using mothballs outdoors is not recommended, as they contaminate soil and water sources.