Pesky insects are a nuisance to many people, and can include FLIES, ants, gnats, and nits. FLIES are small, winged insects that are often seen buzzing around food or other objects. Ants are small, six-legged insects that live in colonies and are known for their industriousness. Gnats are tiny, flying insects that are often found near water sources. Nits are the eggs of lice, which are small, parasitic insects that feed on human blood. All of these insects can be considered pesky, as they can cause discomfort and annoyance.