I'm in the process of looking through the website for solutions, but I thought I would put it on here first. We have 55-60 mixed pullets/cockerels and we have been very fortunate to only have had one chick die on us at week 2 or 3. They are now all 16-17 weeks and they have not started to lay yet. We haven't noticed anything wrong, but when I just went down to let them out to free range, one hen didn't move. At first I thought she was just asleep, but that isn't the case. She is breathing heavy, she is laying down and when I tried putting her up on the roost stick, she couldn't even operate her feet. I have the chickens stay in a pen inside of my old barn and I leave many windows open, but last night and today are very foggy?? Also, yesterday, I started on their winter accommodations (I am going to build a coop within the existing barn and insulate it). This did stir up some old dust (some porcupine crap for sure and who knows what else). They have old hay for bedding and it was recently changed. Any ideas what I should do? These are my daughter's chickens and she has just gone off to school for her second day and will be so upset if this bird dies. Sincerely a concerned Dad!