okay, in all the years I have had chickens, this is totally new to me. My chickens heads are swelling up, I first thought it was a snake bite when the first one got it. They will start swelling under one eye and then it will spread to their entire head. Snot will be pouring out of their nose and mouth. The first one died before I realized it was not a snakebite. Now I have a turkey doing it. I started her on antibiotics. It is not progressing as quickly, but it is still serious.. WHAT IS CAUSING THIS!!! What can I do about it!! My chickens are free range am I am worried they have been in contact with a sick animal or bird. Any info would be much appreciated that would help me put a stop to this. And help save my turkey. Who incidentally I have only had about a month.