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Class Insecta
Order Diptera
Family Calliphoridae

Blow Flies

Flies of the family Calliphoridae, have shiny, metallic coloration so that they are often known as green-bottles or blue-bottles. They generally range from - to -inch long, and are characterized by metallic blue-, green- or copper-colored bodies. In urban areas they are sometimes more abundant than house flies. Females lay eggs on garbage containing meat scraps, as well as on dead animals and animal wounds. They may also deposit eggs onto feces-caked hair or wool on pets and other domestic animals.
The more regularly used common name for members of this family is blowfly, a name that arose because when their larvae (maggots) infest meat they render it "flyblown" making it unfit to eat.  Feeding activity by the maggots causes putrefaction, resulting in the production of gases that give the meat a blown up appearance.

There are bristles on the both sides of their thorax and abdomen tip.  The adult Blowblow flyfly feeds on nectar, honey dew and other sweet liquid, or liquid products of organic decomposition. Most blowfly adults are active during day time. Blowfly larvae usually live in carrion or dung, which help for decomposition. Some species are parasitic on earthworms or land snails. Some live in termites or ants nest.
Larvae (maggots) develop rapidly in warm weather, and maggots often reach their full size on the second or third day after hatching. The entire life cycle usually requires between 10 and 25 days. If an animal or bird has died indoors and is hidden in a chimney, wall void or ceiling, a sudden population of adult blow flies may be seen a number of days later. As maggots mature, they move away from the carcass to pupate.
Maggots occasionally pass through spaces in the wall or ceiling, for example around a light fixture, and drop to the floor. This is a temporary situation, and will end when all food is consumed. This may take up to a week for a small animal such as a squirrel. Adult flies may become a nuisance in the fall, when they may enter homes to overwinter. On warm winter days, they may become active inside, but do not reproduce.