9 of my bantam chickens are finally big enough to be outside. They're about 5-7 weeks old. They're about as big as a pigeon or smaller. I'm using a former dog run as a run. It's about 520 sq. ft. plus an open area under a porch that is another 64 sq. ft. 6' high fence all the way around. I placed a small dog crate with them to use for protection at night/coop. But they seem quite happy to sleep anywhere except the cage. They find a new spot every night and pile up together. They're not able to fly into the trees yet; at least I haven't seen them make it more than a foot off the ground. So do I need to force them into the coop at night so they learn that this is where you sleep?