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Typically, fleas won’t take up residence in human hair. Their natural preference is to live on the fur of animals, but they can bite and infest humans on a temporary basis. If there is a significant flea infestation in the surrounding environment, humans may inadvertently become a host. Again, though, this is a rare occurrence.

Groundhogs are non-aggressive animals that are afraid of humans. They forage for vegetation in yards and gardens, so they can often be seen as a nuisance if you spot one on your property. That said, if you happen to get bitten or scratched by a fearful groundhog, be sure to get checked by a doctor, as they could carry infections or diseases like rabies, Lyme, or the rare tularemia.

It’s very uncommon for roaches to bite humans. Cockroaches don’t need humans for food and prefer to be elsewhere than on a living being. They have no poison or powerful pincers to cause any significant damage. However, in very bad infestations cockroaches have been known to search humans for dead skin cells, which leads to them nibbling around feet, hands, and eyelashes. They don’t cause any serious harm, but this is an easy way to spread the diseases cockroaches carry.

Certain strong smells may help repel bats, though this is not a foolproof method and is best used in conjunction with other deterrence strategies. Scents like peppermint oil, eucalyptus, cinnamon, cloves, and mint are often suggested as natural remedies. To create a spray, you can mix two cups of warm water with half a cup of sugar and a few drops of your preferred essential oil. Apply this mixture using a spray bottle to possible entry points and throughout the affected area, such as an attic. While this home remedy is popular, evidence supporting its effectiveness is limited.