Some say that a kite type of thing with a owl or that on it keeps them away but like everything else they get used to it.
Had to quit getting maize for the winter as they destroyed it and messing in the sheds and as for the stink or them, even when buffering the milkers at the shoulders at milking time had to go back to a nut rather than a blend.
God bless the " kill crow " when it could be got . It was might stuff.
Probaly be easy enough to " make lunch " for them if ya knew what ingredients to cook.
Shooting the a waste of time