I'll send the man up

..he is a Pest Control professional.
You can scatter loads of seed ..watch the feckers flock and then just net em. Most effective killing method then snapping necks

No rules or regs to stop you doing that....unlike seagulls which apparently are still a protected species

The only thing you're allowed to do with them is disrupt nests, and they have a 25yr life expectancy

Banonkers