This will be my first winter with my chickens. I have 2 rhode island Reds and a buff orphington. They have a coop and lay their eggs in their boxes but when it rains and now that it is getting in the 30's at night, they are still sleeping outside in their outside area....even in the cold rain. Is this normal? There is a mouse or 2 that I have notice eating their food and I can't catch them with traps...they are too smart. The chickens wouldn't be afraid of that, would they?? Just wondering how cold is too cold for them? I'm wanting to be prepared for when the real winter hits. I'm in Texas so we don't get crazy cold, but we do get in the 20's and sometimes teens at night. Thanks!!