Female lays 5-6 batches of 75-120 oval, white eggs on moist manure or garbage. Eggs hatch in 10-24 hours. Larvae reach full size in 5 days emerging as adults about 5 days latter. They are ready to mate within a few hours after emerging. During warm weather two or more generations may be completed in a month. Males live for 15 days, females up to 26 if they have access to milk, sugar, and water.