The spongelike mouthparts of the house fly, Musca domestica, are specialized forms of the labium, or what in other insects is
simply the lower lip. Absorbed liquid food flows up through the trunklike proboscis with the action of a pumping organ in the
head. House flies are one of several kinds of fly that lay eggs in rotting plant and animal matter, including dung, making them
common carriers of a number of diseases.
