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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.

No, you shouldn’t have to worry about bats in your yard as long as they don’t make their way inside your house. Typically, bats hang around backyards in order to consume bugs, especially if they’re located in the U.S. Bats that are native to North America can consume more than 500 bugs per hour, so they may actually benefit your yard if mosquitoes are prevalent.

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.

Like many other rodents, squirrels can be a little difficult to get rid of (especially in the case of an infestation), but the best approach is to make the place as unattractive to squirrels as possible. If you do have an infestation inside your home, then professional help may be necessary so you can lay as many traps as possible.