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Yes, filling gaps can help with pest problems in your home. Sealing baseboard gaps reduces small-insect entry points into your home. Even tiny spaces provide pathways for pests, so addressing all gaps throughout your home creates a more effective barrier than spot treatments in individual rooms.

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.

It can be difficult to know what type of animal is in your attic until you see it. But several clues can help you narrow down the suspects:

• Sounds: Smaller animals like rats and mice make scurrying and tapping/gnawing sounds. Larger animals like raccoons and opossums make louder clambering noises. Also, note when animals are noisy: Squirrels are active during the day, while rats are busiest at night.

• Droppings: Rats and mice leave small, rice-shaped droppings (the rat’s version is significantly larger). Bigger droppings belong to larger critters like raccoons. As long as you’re not squeamish, an image search can help you identify what you’re seeing in your attic.

When in doubt, take photos of damage or other evidence and show them to an experienced pest control pro.

You should never use toxic baits or poisons, such as rodenticides designed for mice and rats, to kill or trap possums. Using these toxicants is illegal in many areas and can lead to fines or other penalties. Furthermore, these poisons can cause unnecessary suffering for the animal and pose a significant risk of accidental poisoning to pets or other neighborhood wildlife. Instead of using poisons, it is best to stick with humane methods like live trapping.