I have 7 hens and 1 rooster, all the same age, mixed breeds. They are all about 17 weeks old, no eggs yet. A few weeks ago I went to lock the coop up in the evening and 1 of the girls was missing. I was heartbroken and spent the next few hours looking for her with no luck. Well in the morning when I went to let them out of the coop into the run she was already out in the run! Apparently she had slept on this little bit of shelf above the coop but that is stil safely enclosed in our roofed, secure little run. (it's a perfectly cozy little spot) I figured the roosts in the coop weren't adequate so I changed them around, evened them out, made more space etc. then took down the roost in the run that she used to get up onto the shelf. So she slept back inside the coop with all the others for 2 nights then went right back to her shelf! I decided to let her be so i set up the shelf all nice with a little roost and shavings etc. And she's been there ever since. I'm just wondering why she's left the others and the coop. During the day, she hangs out with them all, she isn't runty or particularly pecked on. She's eating, healthy and all. I'm clueless and I just want to do the right thing! It's warm weather now but what about come winter time? Please offer any insight or advice. Thanks.