My family has rescued 5 hens and a rooster from a not so suitable environment. They are safe and hopefully happy now but my question is this... Some of them have grayish ball like formations on some of their toes. They seem to walk, scratch, eat and drink just fine. They really do not seem bothered. Someone told be that it could be from walking in their own poop for extended periods. (they now have a beautifully clean coop and lots of grassy run). I have searched online only to find nothing. I would like to clean them up if possible and I am wondering if it is hurting them.... I am very new to keeping chickens any help would be greatly appreciated. Thanks!