I'm a total newbie in this whole thing. I got five chickens, kept them in a chicken tractor I built, and then let them out a few days ago. I intended to let them free range during the day and then to keep them in the tractor at night. I'm all fenced in, so they're in the backyard, but they are sleeping in the trees at night. It's kind of cool, but I'm worried about predators (obviously) as well as the weather this fall/winter. So, I need some ideas about how to make them come to their home at night. I thought they would know how much time I spent building it, but apparently they do not care. They are about 4 months old.