i was always told you could tell what color eggs a pullet would lay by the color of their legs. but i have 4 naked neck pullets that lay brown eggs. one has blue legs and the other three have green legs. also the one with blue legs has only half a tail. the actual tail is part way missing. shes always been like that. we think she may have some americana or arucana mixed in. my question, why are they laying brown eggs?