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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.

If you’ve had a prior bat infestation or simply want to avoid having bats invade your home in the first place, there are a few steps you can take without the need for a pro. 

• Seal entry points, such as where your chimney meets your house, or other gaps or holes exist.

• Use bat deterrents like bright lights or ultrasonic devices to force them away from your home. 

• Reduce bat attractions like standing water and bird nectar feeders inviting bats into your yard.

You can find anti-rat sprays in most home department stores that may be worth a try. Spray them along fences and in areas where you don’t want rats to go (like around decks) and they may think twice before approaching. For a natural version, you can try a mint spray, since rats generally dislike mint. But even the most effective sprays are unlikely to stop a hungry rat over time.

When it comes to where raccoons nest, they can establish a home pretty anywhere. They may make their homes in crawl spaces, attics, and chimneys. Barn lofts, haystacks, and even storm sewers can double as raccoon dens. Also, they are known for setting up multiple dwellings for their use.