Fruit flies are small, flying insects that are commonly found near overripe fruit, vegetables, and other organic materials. While they do not pose a direct threat to humans, they can be a nuisance when they infest homes or other structures. Fruit flies are attracted to the smell of ripening fruit and other organic materials. They feed on the yeast and bacteria that grow on these materials, and can lay hundreds of eggs in just a few days. They are not known to bite or sting humans, and are generally harmless to humans and pets.