Fungus gnats are small, flying insects that are commonly found in potted plants, greenhouses, and other areas with high moisture levels. While they do not pose a direct threat to humans, they can be a nuisance when they infest homes or other structures. Fungus gnats are attracted to the moisture and organic matter found in potting soil and other plant materials. They lay their eggs in the soil, and the larvae feed on the fungi and decaying organic matter in the soil. They are not known to bite or sting humans, and are generally harmless to humans and pets.