Close up of flesh fly Sarcophaga bullata larvae feeding on the juices from decaying meat. These larvae will eventually grow into medium sized flies with large red multi_faceted eyes. Some species are known to deposit their larvae in the open wounds of living mammals, a behavior that gives them their common name. As with most flies, flesh flies are responsible for the spread of a variety of infectious diseases. Larvae hatch from eggs and are the second stage in the lives of insects that undergo complete metamorphosis.