Check this out - house flies HATE a hanging bag of water.
According to The Straight Dope, the bag of water creates the illusion of movement…
Evidently, houseflies, being highly edible and defenseless, are nervous types, and don’t like to sit still when they see something moving nearby, because it could be a predator.
The water bag acts a bit like a lens--try it some time--in which the movements of people in the area are reflected. Even if the fly is too far from the action to see it directly, it can see a shifting of light and dark in the water bag, which it interprets as nearby movement, and it will fly away from the bag.
"What's the purpose of bags of water hanging in restaurants?"
July 06, 2009 in Home
