I have some gold sex-links (pullets) that I got from Ideal. They are about 1 1/2 weeks old and quite a few of them are getting either black or dark grey wing feathers in. Is this normal? Will it change as they get older? The gold sex links from Ideal are supposed to be RIR and RIW crosses and from all the picures I've seen they are different shades of gold/red with white. Just making sure I got the right chickens!