For the past 10 days or so one of my hens has started making a gurgling/rattling sound. I think this started when i put her in a broody cage (cage off raised from floor), she was wearing pinless peepers at the time. Now i automatically i assumed she had developed a respiratory infection and isolated her from the rest of the flock. However what is making me question my original diagnosis is the fact that she actually doesn't do this all the time! I can hold her beak to my ear and her breathing sounds perfect. Anyone have any idea what is the cause of this part time rattle? She doesn't make any sound when sleeping or enjoying herself outside her cage in the garden either.