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Generally, squirrels are not considered aggressive toward humans. They are more likely to flee than confront people. However, like many animals, they may exhibit aggressive behavior if they feel threatened or cornered. If you approach a squirrel too closely or try to handle it, especially if it's a mother protecting her young, it may resort to defensive tactics such as biting or scratching.

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.

Luckily, spiders rarely “infest” a home like many other pests. They don’t tend to live in groups except when first born, and prefer their space. But you can prevent them from gaining entry by making sure your home is well-sealed and free of other insects. You can also lay down barrier sprays or powders designed to repel or kill spiders. Professionals can also lay down these barriers to prevent future spider problems.

Yes, crawl spaces can attract bugs, especially since moisture tends to build up in the space, and moisture attracts pests. A good way to prevent pest infestation in your crawl space is to install a vapor barrier—called crawl space encapsulation—on the interior to seal the space, along with a French drain or some other kind of foundation drainage system outside to keep runoff out of your crawl space. You can also seal foundation cracks and repair damages to cut off access to pests.