For the time being I'm building a small 4x4 coop for my three girls with a long attached run. City ordinances allow me to have up to six chickens, and I think my current setup will accommodate that number nicely. But I hope for the day when the city will ease off and allow more birds. Does anyone have any experience with expanding an existing coop? I'm trying to build mine so that I could take it apart and expand, but I'm wondering what people have done. Has anyone added a second coop? If so how do you divide up the chickens? Do they divide themselves?