One of our hens had very hard little clumps of clay/dirt on all of her toes. At first I thought the toes were swollen and dirty. I had her stand in an inch of warm water for awhile. A little mud washed off but each toe still had this hard, almost cement like knob (size of a pea) on it. I held her and after a lot of careful prying and scraping I was able to get one off. I was most relieved as I was afraid she had something systemic. Got the rest off but believe me it was hard. Now I see that some other chickens have this. Should I try to remove theirs'? It's dry here and hot. Right aorund the waterer it's a little muddy. This is the first time I noticed this. Has anyone else had this happen--and what should I do?