I went out to go check on my chicken a few moments ago and I noticed her comb a little blue towards the back. I know this means a lack of oxygen, but I have no idea what could be causing this. She is bright eyed, perky, and being herself. She doesn't seem to be in any kind of distress. I noticed one of her nostrils seemed maybe a bit dirty. I was going to grab some q-tips and water and try to clean them out a little bit, but other than that I have no idea what may be causing her a lack of oxygen. If anyone has any other ideas or advice please speak up. The sun has just gone down in our neck of the ocean so she'll be going to sleep soon. I am going to spend some extra time in the back when I wake up and see how she's doing and and how her comb looks. And give an update.