I went to let me ladies out this morning, and four of them are wheezing, coughing and shaking their heads. I live in Central Valley, CA, where we have had a warmer than usual, VERY dry winter- it's drought conditions already. I don't see any mucus or swelling around the eyes, but one of the girls makes a distinct gurlgling noise when she breathes. We clean the coop every day, and they always have fresh water & food, but they are not drinking much the past couple days. They are eating, but not drinking much water the past couple days They free range most of the day if the weather is good. Our egg production has gone from 9 (full production) to 5 in the past couple days I looked up the symptoms online, and read the article here, but it could be anything from what I've read. One source said flocks sometimes have to be culled because of this. :/ Really confused. Any thoughts?