Could this be a vitamin deficiency? I really worry about the future of my Speckled Sussex. She ate too many pine chips or a big one and was choking on it. I wonder if I should be switching the probios water to vitamin water. What do you think? I don't even know where to get chick vitamins if I need them. I know my daughter had an iron deficiency and needed iron. She had pica as a symptom and ate dirt, rocks, sand, chalk, paper, crayons, ect... It was cured when her iron levels were normal.