I wonder what the penalty would be for feeding them Alka-Seltzer?
Incredibly "...(up to $50,000 for an individual on summary conviction or $100,000 on an indictable offence) and imprisonment (up to six months for an individual on summary conviction or five years on an indictable offence" link
Unless you get a "Migratory Bird Damage Permit"
I'm not sure if Alka-Seltzer is an approved tactic though, lol.