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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.

As a general rule, if you hear an animal in your attic, don’t assume it will stay there. Animals are drawn to warmth and food sources, which could lead them to other parts of your house. In particular, it’s likely that small pests such as rats and mice that only need tiny gaps to squeeze through will end up in your walls and ductwork. Larger animals like raccoons may be limited to an enclosed attic.

By sheer dollar amount, nothing equals a bad termite infestation that can ruin walls, floors, roofs and wooden support materials, requiring massive reconstruction after the pest problem has been taken care of. However, a bad rodent infestation can also cause a lot of damage, as can carpenter ants and bees that made hives within walls. 

No, pest-repellent plants can only reduce the number of pests in your garden—they won’t repel all of them. So, for example, a plant like catnip that repels mosquitoes won’t completely eradicate them from your yard.