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No, poison isn’t the best way to deal with animals in your attic. It’s unlikely to completely eradicate the problem, especially if you don’t take care of access points. Also, poisoned animals may die and decay in the attic, causing noxious odors. 

Some animals may leave the attic before the poison kills them, which could lead to nearby pets or other wildlife eating the animals and becoming poisoned themselves. Ultimately, it’s better to avoid using poison and contact a professional instead.

Setting up an animal trap in your yard largely depends on where you live and the type of critter you're dealing with. In many states, trapping nuisance animals like squirrels, rats, or raccoons is allowed, sometimes without needing a permit. However, certain wildlife species are protected, and not all states have lenient catch-and-release regulations.

Before placing a trap, check your local laws to avoid fines or other legal issues. Some areas allow DIY trapping, while others may require professional assistance. Most areas require a professional to relocate the animal once trapped. Consulting a pro ensures you handle the situation responsibly, humanely, and within the law.

Some suggest mothballs as a deterrent for iguanas, but they are ineffective and harmful. Mothballs contain chemicals like naphthalene or paradichlorobenzene, which are toxic to humans and animals, including iguanas. The fumes can cause respiratory problems, skin irritation, and other health issues. Moreover, using mothballs outdoors is not recommended, as they contaminate soil and water sources.

Notably, earwigs, centipedes, and spiders all enjoy a silverfish lunch. You can’t turn to natural predators to fix your silverfish problem: In fact, one issue with silverfish is that they can bring in unwanted earwigs into the house or cause a minor infestation of hungry spiders, so it’s important to get rid of them as soon as possible.