One employee tried rifle shot. Murphy took his next lesson in bird deterrence from the Lexington Airport. The airport facilities' manager, who is also an engineer, told me they used an ultrasonic device successfully to avoid problems at the passenger check-in area. The unit uses a high-pitched, variable sound above the threshold of normal human hearing but which is annoying to birds. We had no more trouble.
Birds fly in, land on the rafters, and fly right out.
It surely eliminated our problem. In Now the warehouse is clean. And our employees feel better now because the dock is clean. Murphy cites the health factors that were of concern. If bird droppings are allowed to accumulate, he suggests, they can release unhealthy gases.