I have 7 hens, and they are in two different coops (3 in one, 4 in the other). One of my BR hens is molting really hard, and seems a little late to me. My other BR hen (in the other coop) just finished molting, and has grown most of her feathers back in. I noticed that this BR that just started molting has a completely bald butt. Now, all my hens are 15 months old, so this is their first big molt. I have not seen a bald butt on any of the other hens during their molt. Is this normal? Or should I be concerned? Otherwise, she loos good and is acting fine. She is eating and drinking normally, still enjoying treats, and I've not seen any of the others pick on her at all. She's not the top hen, but she's not the bottom either. My hens are all on Layena, and I supplement with a bit of scratch on the super cold days. They also get any leftover fruits, veggies or grains we have. I regularly dust with food grade DE. I don't see any lice or mites. Should I be concerned? Thanks in advance for your advice!