I had a full grown hen develop what could only be describe as "Air pockets" under the skin. I noticed it starting 2 days ago around the neck area. After closer examination it seamed to cover most of her body. It was like a gas was building up between her body and her skin. A "balloon bird" if you will. I know this may sound a bit comical, but I'm not laughing. I have never seen this before. I culled her because she seamed to be suffering. This isn't a please help me save one bird, but a call for help to try and figure out if this is a possible flock killing communicable bio hazard. No other birds seam to be infected at this time. The pen and pen mates have been quarantined, and may be terminated should the need arise. Has anyone ever seen this before? Any help would be greatly appreciated!