In the aviation industry, they used Bird Wailer. It is a airport bird control device that causes problem birds to move away from airport runways, and helipads, using electronic sounds, distress and alarm calls and predator attack cries. This system creates an uncomfortable and disagreeable environment for most bird species. Electronic and natural sounds are emitted at irregular intervals for variable lengths of time, preventing problem birds from growing accustomed to these sounds.

This is how they keep problem birds away from runways and other open airport areas.

If want cheap, then poison them la... cheap cheap

just use the correct bait ...

u mean scarecrow?

how?