Just like their friend the mosquito, house flies are high-volume reproducers. Good news for us is that those pesky flies don’t live forever! The average lifespan of a house fly is around 28 days. House flies develop in four distinct stages, or complete metamorphosis. These four stages are: egg, larva, pupa, adult. Let’s take a closer look
Female adults lay eggs a couple of days apart and lay up to 150 eggs each time. Females lay their eggs in dead or decaying organic material where there is enough moisture for the eggs to develop properly. The egg stage of a fly’s life cycle lasts around 24 hours.
House fly larvae are eggs that have emerged from their egg state. Larvae immediately begin to feed on the organic material in which they were laid. This stage of development usually lasts between 3 to 7 days. Towards the end of this stage, the larvae will begin to venture out in search of a cool and dry place to begin the pupal stage.
The pupal stage takes place inside of a hard, outer shell that protects the pupae as it changes to a fly. The actual change from pupae to fly only takes about an hour, while the total amount of time spent in the pupal stage is 4 to 6 days.
The lifespan of a house fly depends greatly on a variety of conditions such as temperature and humidity. House flies can live for up to 40 days in the adult stage if the conditions are right. Between 4-12 hours after emerging from the pupal stage as an adult, females will begin laying eggs, and the cycle starts all over again!