It's no secret that some species are massively over-populated and should be culled, halas, it is illegal to do so. Considering the nuisance that they are, disease carrying potential (they are apparently worse than pigeons in some respects), as well as their agressive nature, I see no reason for them to be so protected. Then again I also believe that any non-native species should be declared varmint/fair game at the federal level and should be killed at any occasion, without the benefit of a "season". I don't know the English name for it, but take the "moineau domestique", a European import, it has effectively single handedly brought native species (such as the "Merle bleu")to the brink of extinction thanks to it's agressive nature and fast reproductive rate. At least one species of "seagull" has shown the same type of behavior pattern, essentially competing with native species for food and territory to such an extent that the other species find themselves at an extreme disadvantage.