Fly (order Diptera), any
of several thousand species of insects characterized by the use of only
one pair of wings for flight and the reduction of the second pair of
wings to knobs (called halteres) used for balance. The term fly is
commonly used for almost any small flying insect. However, in entomology
the name refers specifically to the approximately 120,000 species of
dipterans, or “true” flies, which are distributed throughout the world,
including the subarctic and high mountains.
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