I'm wondering why one of my chicks is so much behind the others in feather development. We have three 10 day old chicks (RIR, BR and Red Star) and a 7 day old Americauna. The BR and RIR are big and their wings are almost fully feathered and their little tails are about 1/2 inch long. The Americauna is just a bit behind them with lots of wing feathers and an itty bitty tail starting up. The Red Star is growing and just a little smaller than the RIR but she has only the tiniest bit of wing feather - maybe a 1/4 inch- and no tail at all. Do Red Stars develop more slowly? I was worried when I read that roos can develop slower, but this is a sex link. She seems happy and active and eats like crazy, so it doesnt seem like anything is wrong with her- but it does make me wonder.