The funny thing with crows...They know how to tell a gun from a large stick and a clap from a gunshot. They also morn other crows that die, if they are in that family group.
That said, remove the food options and start shooting them. They will learn that the risk is to high. Smart little buggers.
My father used to shoot them and then nail the dead crow to a tree to keep them away. I am not going to do that here. I know they will get eggs and baby birds so I try to keep the babies safe from the crows until they are bigger. The roosters alert everyone when a crow flies overhead but I still don't trust baby birds to be safe until they are older. I am worried about the 15 ducklings I let out of the safe pen now and the two nests that will be hatching soon. The hatchlings and their mothers will go in the safe pens but I was thinking the ducklings I put in the yard were big enough and now I am not sure after watching the crow carry off a bunny. I have three mother rabbits with two litters of bunnies so you would think they would protect their babies.