Here, in my city it exist 2 large parks full with bird feeders. I didn't count it, but I'm pretty sure is more than 500. Every school year contain 2 "special weeks", a "green week", and a "school elsewhere week". 3 years ago, in the green week the majority students from city made it and placed bird feeders in parks (the project it was supported financial by the mayor's office of the city). It's really nice, and a ray of hope that we (humans) can do good things together...