I have something going on in my coop right now...I thought at first it was mites, chickens pecking what I assumed were "bugs" off of each other....and on some, the feathers on their back, right above the tail were looking like they were thinning....I also noticed on a couple that their area around the vent and backside (kind of where there thigh is) were looking red and "beefy" and were missing the feathers. I started treating for mites...but then noticed a couple that had diarrhea....and then I started to worry about vent gleet. No one appears to be quite as bad as some of the images I found online...I did give them some yogurt yesterday. I have some Red Sexlinks, Rhode Island Reds (who all appeared to be in perfect order) and a few Black Giants.... This morning I went into the coop and a RI Red was still roosting, with her head totally down and she was not really moving. I thought she was dead...I went over and touched her and she was alive but was totally listless. I carried her out of the coop and set her on a log and she didnt move from the way I set her down. What could be causing it?? Her feathers are all intact and she appears perfectly fine aside from this. Can I help her in any way? I'll try to post some pics of the others with the bad feathers...I'm just sort of devastated over here thinking my whole flock is going down the tubes.... It's about to snow a great deal here, and weve had a lot of rain and not much dry periods...which is why I originally thought mites.... Any help much appreciated!!