I have 8 week old pullets, and right now I am closing them in the henhouse at night, with a sliding door, to keep rats out. I did not do this with my adult hens and never had a problem with rats hurting the adult hens, though rats would go after the feed. BUt the pullets are smaller, particularly one which is a Sultan Bantam, and I'm worried the rats could kill her. (I had rats kill several of my Japanese quail last year). What do you think? I have the coop totally enclosed with wire on walls, ceiling, everything so no coons or opposum can get in, so for years I haven't used a door on the henhouse, but if rats can hurt the pullies I would continue to use the sliding door to close henhouse at night.