Hi. I have three Buff Orpingtons, all purchaed at the same place. They are about 4 weeks old now and one is much smaller than the other two. She is happy, eating and drinking well so I'm not concerned about that. Just think it's odd that she's so much smaller. Can that happen? Are there "runts" in the chicken world? One of the Orps has turned almost completely white. Is that normal? Can there be variations of color? The photo attached shows both the small one and the white one. Thanks for your thoughts. This is all new to me and I enjoy learning everything I can about them.