We used to live in Leiden and every year the great gull nuisance controversy made the news (eg here, here, here, here and here)
This year the city has distributed 150,000 yellow trash bags to businesses in the center of Leiden to foil the sharp beaks of the gulls.
In previous years Leiden has tried using falconers to frighten the birds out of the city and several different egg-snatching or -coating schemes, with little result.
