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Originally Posted by Carleton Hughes
Flies are annoying, disease carrying and generally obnoxious,the floor of my vacation cottage up the adirondacks is black with their corpses each summer
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You're probably looking at the remains of cluster flies, which resemble houseflies but are totally unrelated. They're earthworm parasites as larvae, and as adults they try to find shelter from the winter so they can go out and lay eggs on earthworms in the spring. They can be annoying in the house but are basically harmless.