I have 5 chicks, two of which are barred rocks. The others are an EE, RIR and a Delaware. We were told the EE is a week older than the rest, and you can tell. Its huge and has a ton of feathers. While all the chicks are growing and feathering, the barred rocks have considerably less feathers than the others. The have just a few tiny rows of feathers on the edges of their wings so far. Is this normal to the breed or what? This is my first time with chicks so I really don't have a clue what to expect in this regard. Thanks!