Pesky insects are a nuisance to many people, and there are several types of them. A GNAT is a small flying insect that is often found near water sources. Flies are also small flying insects that can be found in many places. An EARWIG is a small insect with pincers on its rear end. Fleas are small parasites that feed on the blood of mammals. Wasps are larger flying insects that can sting humans. Finally, midges are small flying insects that are often found near water sources. All of these insects can be considered pesky and can cause annoyance or discomfort.