A few years ago where I used to go beating on an estate the gamekeeper got tasked with organising a crow culling day, as part of the estate which farmed pigs was literally inundated with crows that came in from miles around to nosh on tons of pig feed every day
The keeper set all the bale hides up on the main flight paths 3 weeks beforehand to let the crafty bstards get used to them.
On the day of the cull, the 8 of us who were shooting got there before dawn and set up in our designated hides, the estate supplied all the cartridges and a radio to be able to call for more shells when we started to get low.
As first light appeared so did the crows and then the carnage commenced. It sounded like the Battle of the Somme all day long with continuous gunfire from all parts of the estate. It was the best days crow shooting I have ever had and one which I will never forget.
Between the 8 of us the days total was just over 3000 of them with the gamekeeper personally accounting for 700.
Two weeks later the farm was alive with them again.