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These stout, medium-sized flies are grey or black, with darker stripes and other patterns. The species Musca domestica (Common Housefly) is a typical example. Larvae are opportunists that feed in decomposing organic debris, preferably with some animal matter. The adults occasionally visit flowers with exposed nectaries, particularly in the Carrot family. A few species, such as Stomoxys calcitrans (Stable Fly), will bite warm-blooded animals, seeking blood or salty perspiration.