Yes, in some cases if your damper is left open, animals can come down your chimney. In these instances, it’s more likely that they have fallen in while looking for a safe spot rather than entered your house intentionally. Leaving your damper closed or installing a chimney cap can prevent animals from coming inside.

No, mothballs do not keep bats away. Not only are mothballs completely ineffective when repelling or removing bats, but using them could be illegal, depending on where you live. Remember, bats are federally protected, and it's illegal to use chemicals during the removal process, and mothballs tend to fall into this category.

Using audio and visual methods to discourage birds might work initially, but birds tend to acclimate to them over time. While chemical deterrents can show some effectiveness, their results can be inconsistent. Some may dissipate too quickly, and there's a risk they might cause unintended damage to your surroundings. Additionally, birds might become immune or resistant to the impact of such treatments.

Strong scents like peppermint, rosemary, lavender, citronella, and others can repel woodpeckers—as pungent smells can overpower their senses. For that reason, you might consider making a homemade spray with one or a combination of these scents to spritz around areas of your home where woodpeckers frequent.