Flies such as the housefly and blowfly are consumed. The housefly ("Musca domestica") is a fly of the suborder Cyclorrhapha. The housefly is the typical sponging insect. When metamorphosis is complete, the adult housefly emerges from the pupa. The housefly, "Musca domestica", is the best known and most important species. The antimicrobial peptides produced by housefly maggots are of pharmacological interest. Blue bottle flies are typically long, almost twice the size of a housefly. They are fairly large flies, nearly twice the size of the housefly. Hydrotaea is a genus of insects in the housefly family, Muscidae. The adult form of this insect is about long, slightly smaller than a housefly. The onion fly has an ash-grey body and resembles a housefly. Many strains of housefly have become immune to the most commonly used insecticides. They are larger than the common housefly and smaller than the horse-fly. The claws help the housefly to unstick the foot for the next step. However, by 1947 housefly resistance to DDT had evolved.