There are more than 240,000 different species of flies in the world. Approximately one third of them, including mosquitoes and gnats, can be found in the Canada.
A true fly has only one set of wings. All flies are known disease carriers, many of which can be transmitted to humans. Flies typically breed in garbage, excrement of animals and humans, sewers, compost piles, and any other place where matter is decaying. This enables them to pick up various kinds of diseases which can be transmitted to people by biting or by landing on food, where the bacteria and viruses are released. Since flies are able to transmit disease so easily, it is necessary to seek insect control quickly.
All flies have a rapid rate of growth and go from egg to adult in about seven days. Maggots are just one stage in the early development of a fly.