An annoying insect is a creature that can be very irritating and difficult to get rid of. Three examples of annoying insects are the GNAT, LOUSE, and FLY. A GNAT is a small, two-winged FLY that is often found in large swarms. A LOUSE is an insect that feeds on the blood of mammals and birds and is usually found in the fur or feathers of animals. Flies are small, two-winged insects that are known for their ability to quickly move from place to place. All three of these insects can be very annoying and difficult to get rid of.