hey all. so, I've noticed that on many of my RIR hens, their beaks are always dirty...and their combs have what i'll describe as a very dark brown crust on areas of them. I'm not sure if it's just caked on dirt or what. I tried to scratch it off one of them but she wasn't too happy about the inspection so I just left it at that. Their behaviors seem normal and they are laying on the regular...eating well...roosting normally....they are out in the yard a bit and are always scratching in the gardens and compost bins. We keep their coop clean (pine shavings in the coop, sand floor in the run which we hose off or rake out regularly). without seeing a photo of them, is anyone able to lend any advice as to what I should do, if anything, about this? Thanks, all.