One of my hens started limping yesterday. I've really looked at both of her feet and I see no difference on the one she is favoring. Visually, there is nothing wrong with the foot. When I touch it, she does curl her toes inward as if to protect it. The only thing I have noticed is that the foot that is not bothering her seems warmer than the foot that is a problem. It's like she has a circulation issue in the bad foot. Other than the limp, she seems absolutely fine. Eating and drinking well. Any ideas as to what this could be? Thanks in advance!