I recently got a few black australorps that were supposedly six months old. One just started laying and her comb is a lot redder than the other one but shes a lot smaller. The other one is a lot bigger but her comb is a lot lighter. Is that possible? Or could it be that she is older? Do the combs get lighter as they get older? She just dosent seem to be only six months old and im wondering if I got robbed.