Actually, it used to be common for little old ladies to feed pigeons in central park, NYC. I think it mostly just depends on where you are and the temperament of the feeder and birds. read more
As far as I know, seagulls are not considered inedible as such. It’s just that due to their lifestyle and diet, they are rather tough and have a taste that most people find quite unappealing. In other words: They are not nice to eat. read more