Flies belong to a group of insects called Diptera; insects with two functioning wings. Most flies lap up their food with special sponge-like mouthparts. Many will ‘vomit’ digestive juices onto their food then sponge it back up. Others however, are not so repulsive and have piercing and sucking mouth parts – such as the mosquitoes, sand flies and March flies.

Although we tend to see flies as pests, they do play some critical ecological roles such as recycling and pollination. Without blowflies, the amount of dead animal carcasses (particularly on road sides) would be overwhelming. Flies also help to control other species. Some flies are predators, feeding upon other insects. However, many more are parasites, being much more subtle in their attack on other animals. Many species of parasitic flies have a particular ‘host’ animal which they favour, and somehow manage to lay their eggs upon unsuspecting individuals. Even predators like spiders and praying mantids that rely on flies as part of their diet are parasitised by flies. The host being unable to defend itself as maggots slowly consume it from the inside out.

Many people have marvelled at flies without even knowing it. The glow worms in caves and rainforest areas are actually fly larvae, which use unique methods to catch prey by luring it towards their sticky thread traps with beads of light.

There are however several species of flies in Australia that have significant economic impact. The Australian sheep blowfly (oddly named as it originated from South Africa) causes an estimated 280 million dollars damage to the sheep industry each year. Fruit flies such as the Queensland Fruit Fly and the introduced Mediterranean fruit fly in Western Australia threaten our fruit industries, and a great deal of money is spent each year controlling them.

All in all, although we often find flies difficult to live with, we certainly could not live without them fulfilling their roles in our ecosystem.