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Yes, bats can cause quite a bit of damage to the attic. Their weight and movement from flying around can damage insulation, and they can chew through wiring and the walls. As if this isn’t enough, they leave their droppings throughout, which carry harmful bacteria and is dangerous for humans to breathe in, not to mention the extremely foul-smelling odor.

Metal coil-shaped retriever tools (around $50) help remove empty nests and debris from chimneys. Unless you are sure the nest is vacant, we recommend calling in a pro to handle bird’s nest removal from chimneys, vents, roofs, and other hard-to-reach places.

Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

Preventing rats and mice from getting into the attic can be challenging, but it’s not impossible. Here are a few steps you can take to keep them looking elsewhere for a new place to call home:

• Block or cover any potential access holes

• Keep piles or stacks of firewood or other materials away from the house

• Seal food and garbage in containers to prevent rodents from chewing through or getting in