The common name "flies" encompasses a very diverse group of insects that belong to the order Diptera which
means "two wings." They number over
120,000 species worldwide. Only the coldest parts of the earth (the Arctic and
Antarctic) are devoid of flies. Some members of this order are well known for
their disease carrying capacity such as the mosquito and Tsetse fly, while
others are pollen gatherers and mimic bees. Fly larvae (maggots) play an
important role in the clean-up of carrion.