Blowfly, a fly with a black head and thorax and metallic blue or green abdomen. It is 1/4 to 5/8 inch (6 to 16 mm) long and has bristles on its thorax and at the base of its wings. The females of most species lay their eggs on decayed meat or dead animals. However, the females of several species, such as the screwworm fly, lay their eggs in the wounds of warm-blooded animals. Screwworm.) The larvae, called maggots, hatch within 24 hours.

The blowflyThe blowfly has a black head and a metallic blue or green body.

A common species of blowfly is the bluebottle fly. It is about 1/2 inch (13 mm) long with a gray head, black sides, and a metallic blue abdomen. The female lays her eggs on animal wounds and rotting meat.

Blowflies belong to the family Calliphoridae of the order Diptera. The bluebottle fly is Calliphora vomitoria.

The bluebottle flyThe bluebottle fly and its maggot.