Its a game of odds because flies are dumb and not smart enough to figure it out. If your front door is open 0.1% of the time and there are 100 flies around your house a day, every 10 days you’ll get a fly in the house. However, that 1 fly only has that same 1:1000 chance to get out the open door, he’ll be there for 1,000 days. The chances of getting ANY fly IN the house is a lot greater than getting ONE SPECIFIC fly OUT.
Flies are basically organic drones with simple programming. They don’t use thought processes, they use instincts/programming, and they have no program for “invisible walls”. To them, it’s an empty space that they suddenly and inexplicably smack into. They can’t puzzle through it, that requires thought. So they just keep following their program, and like a roomba stuck under the couch, if the programming dosn’t work they will keep going until the program tells them to do something else or until the battery runs out.
Flies have an undivided bilateral brain structure, and are missing the Ockner-Abbott gene, which provides the pitch/yaw functions in birds and other winged creatures. As such flies cannot navigate as we think of it. They can remain airborne, land, take off again, but the lack of the gene basically means a fly is functionally trapped in any room the fly finds itself, unless it simply and coincidentally flies through an opening.
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