A female adult housefly lays up to 500 eggs in her lifetime, but in a normal environment, only 2 to 4 percent of the fly eggs laid make it to adulthood. A house fly goes from an egg laid in manure to an actual fly in no less than eight days. The female lays her eggs on or close to rotting organic matter – manure mostly, but also rotting vegetation. These eggs hatch into larvae, which feed and pupate. Adult flies emerge from the pupae; there are no “baby” flies; when each fly emerges, it is already an adult.
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