blow fly, (family Calliphoridae), also spelled blowfly, any member in a family of insects in the fly order, Diptera, that are metallic blue, green, or black in colour and are noisy in flight. With an average size of 8–10 mm (0.3–0.4 inch), they are slightly larger than houseflies but resemble them in habits. Among the important members of this group are the screwworm, bluebottle fly, greenbottle fly, and cluster fly.

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