I am new to back yard chickens, we have 3 hens and 3 young birds about 3 months old. Today we discovered that one of the young hens has a issue with her foot. Just one of the feet is curled up, in a tight ball, and she is walking on the top of the foot. Upon further investigation, she is missing part of a toe. It is very cold here at night, so at first I thought some sort of frost bite, but I'm not convinced. I looked up Merck's and I don't think that is it. She is walking around fine and eating, she is just walking on the top of that balled up foot. Does anyone know what this could be?