Answers

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Reply	Paul says: Maybe the mist is caused by the cold bodies of the flies cooling warm air from in the house which is creating condensation on the window. It could be that when you had returned from holiday, the flies had already been dead for a significant amount of time and dried up which would make them undesirable prey as there is no nourishment left in them. As to why they all collected at the porch window, the only thing that i can think of is that they were trying to get in the house where the temperature was warm.  (no votes) Tags: domestic science, animals, plants.
	posted on 2009-01-07 22:56:00 | Report abuse

Reply	Norman says: I have seen similar mistiness around dead flies on glass and I believe it is a fungus of some kind. Sometimes you can see a web of threads. Whether it kills the flies, or merely grows on their dead bodies, I don't know.  (no votes) Tags: weather, unanswered, domestic science, animals, planet earth.
	posted on 2009-01-08 13:24:00 | Report abuse

Reply	Anonymous says: blown onto it by wind and died at the impact. fungus seems likely also  (no votes) Tags: weather, unanswered, domestic science, animals, planet earth.
	posted on 2009-01-08 14:26:00 | Report abuse

Reply	dmm says: You left dead flies all over your front door for 2 weeks?? Yuck.  (no votes) Tags: weather, unanswered, domestic science, animals, planet earth.
	posted on 2009-01-08 15:28:00 | Report abuse

Reply	Thomas says: There are quite some fungi that prey on insects. They can even grow on living, flying insects, covering them with white, hairy stuff. My guess is that the flies got infected and died on the window, and the mist is just the fungus growing spores.  (no votes) Tags: weather, unanswered, domestic science, animals, planet earth.
	posted on 2009-01-08 15:55:00 | Report abuse

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