Another source close to the earth tells me: I lived on a farm for 20 years, and it was clearly demonstrated on our land that gas guns are a waste of time. The birds do get used to them and will happily strip a field of young shoots whilst watching the gas guns do their stuff! There are other methods that can be used – some quite grim, but effective. To hang up a number of dead crows in the field gave a good result .
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