This morning on my walk, I was greeted by a yellow fly. Remembering a long ago observation I made on a yellow fly in my computer room, I later did a brief Google search to see if anyone had made the same discovery as I. My finding was that the yellow fly ignored me and was completely captivated by a very warm transformer which powered my soldering iron. So it would seem that they search for prey using infrared sensors. This is evidenced further by observations of other researchers that the fly operates mainly within shady areas and avoids direct sunlight … which would saturate its sensors.
This suggests that a good yellow fly trap would be a warm item surrounded by fly paper.
