What were you expecting from this hatch? You can breed a BC or a Silver Birchen to Cuckoo hens and get Black sex links so the black babies would be pullets....if you were just wanting dark egg layers that would be cool. If you were thinking breeding stock well I think you have quite a project and you should have fun with the colors and learn many things. I'm keeping mine all separated only trying to get feathered shanks on my Cuckoos. Still sometimes off colors are neat and you can work with them I think it's hard enough to get the right type without having to cull for off colors but that is me. I do have a split Birchen who is pretty and I've thought about crossing him with my hatchery girls who lay dark eggs for sex links many people can't have roos and then they would know right away what they have .....You have some cute babies and it will be fun seeing what colors they turn out to be