I don't have a coop yet and am researching coops to build for five or six chickens that I also don't have yet. I was wondering, that if you built a really predator-proof run that is attached to the coop, does the coop have to have a door (for the chickens) on it? Do they have to be put in at night and let out in the morning so they won't roam the run all night, or is the door just to ensure you can keep predators out at night? I thought maybe you could do like a doggy door with strips of heavy plastic sheeting (kind of like the outside shopping cart door at Walmart) so the hens could go in and out but the weather mostly stays out. Thanks for your input.