I am interested in this black copper discussion. Will chicks eyes lighten up over time? I have a 3 1/2 month old pullet. She has copper feathers on her hackles but her eyes are very dark. She is the only marans chick growing out with a variety of other chicks and everyone else had much lighter eyes. I thought it was just cuz she is a diff breed that her eyes looked so dark. Is this something that can be worked on with "compliment breeding"?