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Fly is the generic name of an extensive group of species of insects pertaining to the order of the Diptera.
120.000 species of fly have been classified, and some scientists consider that there is a million alive species nowadays.
Therefore, one of each ten species animals recognized by science is a fly, and exist more species different from fly that of vertebrates.

The flies have a body with head, thorax and abdomen; two completely formed wings; eyes made up of hundreds of sensible facets to the light individually, and buccal pieces adapted to suck, to lick or to perforate.
No fly is able to bite or to chew, but many species prick and suck blood.

Its service life is holometabolic, composed of four morphologic phases: the egg, the larva or maggot, the nymph or pupa, and the adult. Some species complete this cycle in few days; others, in one or two months.

The flies comprise of almost all the ecosystems, in all the terrestrial habitats. The consequences of their presence in the environment and the human society are of exceptional importance, because along with the mosquitoes, and only after the pathogenic man and microorganisms, the flies are the alive beings who cause to more damage and death in the planet.

They are signal officers of a great amount of diseases, including cholera, dengue, dysentery, yellow fever, malaria, salmonelosis and typhoid fever; they produce earthworm in the cattle and the man, and cause to significant losses in the production of fruits and other vegetables.

The flies are also very important organisms in the recycling of the origin remainders animal and vegetable, an essential process for the permanence of the Earth life.
They are also necessary like food of birds, frogs and other reptile, bats, spiders, and insects several. Many flies also participate in the pollination.

(Trans. of Babel Fish)