My Plymouth Barred rock hens have something wrong with their back. I’ve never had chickens before and I’m trying to figure out if they are just molting, being beaten up by the other hens or something else? I figured I would see if anyone else recognized this and had some advice before i called in a vet. It’s been a really wet/cold winter... we keep their coop clean and as dry as possible and I put some diatomaceous earth down recently in their normal dirt bath spot. but that’s the only current change. Thanks!!