Though often annoying, insects perform a vital function in the world’s eco-system. Their small size makes insects innocuous to most, however up close and personal insects may evoke other emotions.
Wasp
Wasps are critically important in natural bio-control. Almost every pest insect species has a wasp species that is a predator or parasite upon it. Parasitic wasps are also increasingly used in agricultural pest control as they have little impact on crops. Wasps also constitute an important part of the food chain.
Fly
Flies rely heavily on sight for survival. The compound eyes of flies are composed of thousands of individual lenses and are very sensitive to movement. Some flies have very accurate 3D vision. A few, like Ormia ochracea, have very advanced hearing organs.
Caterpillars
Caterpillars have rightly been called eating machines. They eat leaves voraciously, shed their skins generally four or five times, and eventually pupate into an adult form.