True flies are insects of the order Diptera. Insects of this order use only a single pair of wings to fly, the hind wings having evolved into advanced mechanosensory organs known as halteres, which act as high-speed sensors of rotational movement and allow dipterans to perform advanced aerobatics. Diptera is a large order containing an estimated 1,000,000 species including horse-flies, crane flies, hover flies and others, although only about 125,000 species have been described.
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