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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.

Most spiders are harmless and are more interested in finding and eating insects than trying to bite you or your family members. Certain spiders in your home may be advantageous if you have an issue with insects. Most spiders are non-venomous and have small mouths, so even if they did bite you, it wouldn’t be enough to cause any harm.

However, some species of spiders can cause harm if you are a victim of their spider bite, including the black widow and brown recluse varieties. Both species’ venom is poisonous, and you should seek medical help if bitten.

You’ll find groundhogs are most active during the morning hours and late afternoon, but they want to avoid humans at all costs. If you do set a trap, you can set it out the night before so it’s waiting on them the next morning, and try to remove any human scent when setting it out.

According to the Internet Center for Wildlife Damage Management, no frightening devices are proven effective for squirrel control. This is likely because the squirrels quickly become habituated to the noises. However, strobe lights show some promise, so motion-activated lighting could be an option worth considering as part of your integrated pest management strategy.