TheHorsefly Trap TAON-X captures horseflies by misleading the female horse flies. The black ball is heated by the sun and moves back and forth in the wind. The horsefly is attracted by this moving heat source, because the horsefly "thinks" that it is a prey to her. The horsefly lands on the ball and flies, disappointed, up to the light. Then she flies into the trap that is attached at the top of the funnel.