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Unlike for rats and mice, poisonous baits and fumigants aren’t a legal option for dealing with squirrel invasions. So, don’t set any traps up using standard rodenticides. Remember that you typically need a permit for trapping and relocating squirrels found on your property. Some states even specify the types of traps you need to use.

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.

Gophers do not hibernate, meaning you could, at least theoretically, have a gopher problem in your yard any time of year. During the colder parts of the year when soil isn't as easy to work with, gophers may not dig as many holes or be as active and instead will burrow deeper into the earth to go below the frost line to stay warm.

You can expect to see more gopher activity during the spring and fall when warmer temperatures make digging easy, and there is an abundance of new (or recently harvested) plant life available for them to graze on. They come out during the day and sleep at night.

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.