We have owned chickens 2 years now and this winter have come into a problem where a chicken will look to have a resp. disease. They slow down/lethargy, hunch their bodies and the color around the eyes changes. There is no swelling, no mucus, no drainage from nose, no rattle to lungs. They eat and drink for the first few days like nothing is wrong and suddenly decide to stop eating. That's when I start feeding them. I hate using meds but have used a couple trying to figure out what might be the problem. Looking info up I thought maybe gape worm. Not gape worm though. So we decided to learn what might have caused the problem by doing an autopsy. Not that I know much about the insides of a chicken other than what I have seen from others posting. Anyway, here are a few pictures from the autopsy. The things I noticed posted with each picture. Bottom of bird around the breast bone very red before cutting. Checked for signs of skin opens but found none. Bird is aprox. 12 weeks old has a lot of fat inside. from other pics I've seen this is about normal. Spleen- black. I do not recall anything about a spleen being black. Is this normal? I'm thinking it is not and perhaps a sign of infection? Another view of the spleen which looks to be enlarged? Sorry for all the graphic pictures but I am at a huge loss as to what happened to my boy. He was young and healthy one day and the next began to hunch like one of our hens did a few weeks ago. We did not autopsy her but now I wish we had. We cut into every organ and the intestines looking for lesions, worms, any kind of sign or indication of what might have caused the problem. I would be happy if anyone could help with suggestions of where I can look for answers because so far I haven't been able to find any. I am hoping this is the last bird that dies from this but I'm worried it isn't going to be. thank you for looking and again sorry for the graphic pictures.