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Or Bluebottle as we know it. Biology and Behavior: Blow/bottle flies will lay their eggs on animal carcasses and manure as well as decaying vegetables, grass clippings and leaves. Eggs are laid on a suitable decaying organic material and larvae hatch out and burrow beneath the surface where they feed. After a few days feeding, larvae emerge and crawl a short distance away from the breeding source and burrow into the soil to pupate. Adults emerge several days later. The entire blow/bottle fly life cycle can take from 10 days to three weeks depending on environmental conditions. Forensic entomologists track these environmental conditions and compare to larval development from maggot specimens collected from bodies to help determine time of death. A single mouse carcass can produce over 100 adult flies. All in All,This makes for a rather fascinating after dinner conversation...R.