Bottle lies are easily recognized by having a metallic green or blue appearance. They deposit their eggs in decomposing organic matter, and their appearance indoors indicates that decomposing matter is present nearby. Check for garbage than may need to be removed or cans that may need cleaning. Dead animals may also be the source of a sudden infestation of bottle flies. A forgotten mousetrap or a dead animal inside a wall, chimney, or attic may lead to a bottle fly infestation.

Cluster Fly females lay their eggs near earthworm burrows, and the larvae then infest the worms. However, the flies are a nuisance; when the adults emerge in the late summer or autumn, they enter houses to hibernate, often in large numbers; they are difficult to eradicate because they favour inaccessible spaces such as roof and wall cavities. They are often seen on windows of little-used rooms.

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