|Courtesy Vera Mendes, Flickr|
As the female horsefly’s primary sense for locating a suitable prey is by sight, they are attracted to large, dark objects and by motion, their eyes being well adapted to prey detection. The H-Trap mimics an ideal target for horseflies to land upon. A free standing structure, the H-trap comprises a metal frame from which is hung a large black plastic ball and a funnel trapping mechanism. The insects are tricked into mistaking this ball as a large animal, such as a horse. They are attracted to the ball since it warms in the sunlight and emits infra-red radiation or heat, exactly like the body of a large animal. Once they land on the black ball, they will investigate and try to bite it. Since they will be unsuccessful in finding a blood meal, they will follow their natural behaviour and fly away. As horseflies naturally fly upwards on take off, they are caught in the surrounding hood system and funnelled upwards into a centrally placed collection bin, where they are caught in soapy water and die.