This all started about 3 weeks ago. We have a year and a half old Black Austrolorp, who 3 weeks ago came charging out of the coop with the other girls when I let them out that morning. I noticed that by late afternoon she was sitting in the shade by herself and wasn't acting herself. This has been going on for three weeks now. She will put herself to bed in the coop, but will not get up on the perch with the rest of the flock. Her comb has gone from bright red to almost light purple, her tail is drooping, and she has runny poo's. She is eating and drinking and stay's with her flock. I have started to notice that she is walking at times unsteadily almost like she is drunk. She will stop and pause then walk a little farther sometimes stopping to sit down. She doesn't appear to be in any pain and is very alert. Any ideas out there?