I bought 2 red sex links from Tractor supply about 2 weeks ago. I'm not sure how old they are, I think they were sitting at Tractor Supply for a few days or maybe a week before I picked them up. My question is, they are growing rapidly and developing their feathers. One of them is growing just feather shafts along the spine and kind of resembles a porcupine. Is this normal? I don't suspect lice or mites because no other chick in the brooder is having this problem.