Fly pupae are the stage in the life cycle of a fly when the larvae develop into adult flies. They are similar to butterfly cocoons, with hard, brown shells that protect the developing flies. During this stage, the pupae remain inactive for three to six days, after which the adult flies emerge. The pupae develop legs and wings during this period, ultimately becoming fully grown house flies

. The house fly has a complete metamorphosis with distinct egg, larval or maggot, pupal, and adult stages

. Fruit fly pupae are small and not easily noticed, with a hard shell. They typically spend about six days in the pupal stage before emerging as mature adults