There is enough room on a piece of excrement to support as many flies as will fit. I wonder how many flies actually die as a result of starvation because the ecosystem cannot support them.
An unpleasant thought, perhaps, but there do not seem to be a shortage of maggot candidates for flyhood.
As a child on family vacations in the bush, my cousins and I applied flyswatters with gusto so that our family could picnick in peace without flies setting up shop on every plate and brazenly planting their flag in the potato salad. It was futile. No matter how many we killed, there were always more to take their place at the table.
So I am wondering about the use of electricity as a deterrent to flies, as opposed to merely using the rackets to execute them. There seems to be a tiny possibility that some flies could be less sensitive to it, and that once you cull those individuals from the herd, this problem becomes more manageable. Whereas swinging at them with conventional perforated plastic flyswatters just weeds out the slow and/or the aged.
How could one use a fly as a NCV test subject? There used to be electric "Bug zappers" in people's backyards in the 1980's in the US... These often sported purple "UV" bulbs to attract insects. I don't recall them killing houseflies by the thousands, so could it be possible that flies (and some other insects) know to give them a wide berth?