Which type of fly has a shiny black, metallic green, blue, or bronze abdomen?

The blow fly is characterized by its distinctive shiny black, metallic green, blue, or bronze abdomen, which sets it apart from other types of flies. These colors are a result of the fly's anatomy, specifically the structure of its cuticle, which reflects light in a way that creates that metallic sheen. Blow flies are often associated with decaying organic matter, where they lay their eggs. Their identification is significant in pest control, as different fly species can indicate varying conditions of sanitation or decay. The shiny appearance is not found in the house fly, fruit fly, or stable fly, making the blow fly easily recognizable and important to understand in the context of structural pest control.