The unsolved problem here is that they kill birds in a pretty unpleasant way, setting them on fire. I'm going to ignore utilitarian arguments about what else ki

The unsolved problem here is that they kill birds in a pretty unpleasant way, setting them on fire. I'm going to ignore utilitarian arguments about what else kills birds, the general public doesn't like the idea of birds being immolated by the fiery rays of the Sun and neither do I. I don't think it would take many drones to eliminate this, though. Birds don't like coming near drones and when you have a huge tower with oversight of the region you need to protect, finding the birds well before they combust seems tractable.