When I worked on the ramp at Bournemouth (Hurn) airport, I used to see the fire crew doing their bird scaring duties. They would drive around making squawking noises and firing things that went bang. The birds would take off, fly around for a while and then land back on the airfield.
I suggested that perhaps if they used a 12 bore shotgun and killed a few, the others might get the idea they were not wanted around the airfield and bu**er off.
Not allowed !!!!!!!!!!!!!!!!