I have an Americana that I have had since it was a day old. They havent even started to lay yet. I noticied a stange noise from the pen and whatched the girls to see what was going on. I have one that is making a strange wheezing like noise. And her mouth is open when breathing. What could that be? This is bad because I have around forty birds and all but the 10 americanas are laying. They are all in the same house in separate pens. Need help ASAP !