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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.

Some snake repellents are risky to use around people and pets because they use the active ingredient in mothballs, naphthalene. The United States Environmental Protection Agency (EPA) has classified naphthalene as a carcinogen that can cause damage to the liver, neurological issues, and cataracts. 

The Colorado State University Extension suggests there’s not enough conclusive evidence of the effectiveness of snake repellents to recommend their use.

Although raccoons aren’t particularly picky regarding food, certain sounds, metals, and smells bother them. You can place these items around your home to keep raccoons away:

• Place wire mesh screens around and underneath decks and porches to prevent raccoons from nesting. 

• Put metal sheeting around the edges of your roof or at the base of trees to deter raccoons from coming close. 

• Place a loud battery-operated radio near the raccoon’s den to keep them from nesting.

• Keep a bowl of cider vinegar on your deck or porch.

• Remove old raccoon scents by thoroughly cleaning and disinfecting underneath porches and decks.

Some stores sell smoke bombs to drive animals out of spaces, but we don’t recommend you use them, especially in an attic. The smoke can be toxic to humans or pets that may accidentally inhale it. Meanwhile, critters can easily escape the smoke by temporarily leaving the attic, only to return via their usual entry points after the smoke clears.