Need some advice please. I have 3 French Black Marans & a little silkie, all 5 months old, that insist on sleeping outside in their coop run, rather than inside their coop/nesting area. This was fine in the summer but now it's getting colder. NOT ONCE will they go inside the secure coop/nest box area. My other 5 hens go in there and lay their eggs daily, so I know THEY like it. What gives? Should I just not worry about it? They are free range but I worry about predators at night (I don't close their run door). Anyone?