A couple weeks ago one of my 6 hens was just not being herself. She hasn't laid in over a year, and is probably 3 years old, or more. She was just being lethargic, not greeting me in the morning, not being her usual bossy noisy self. Her symptoms gradually got worse and worse until she just died. In her last few days she didn't seem to be eating, and her eyes were sunken. No outward discharge except the yellow diarrhea. She was quarantined for about a week before she died, and she's been buried since last week. Today another one of my 5 remaining hens started showing the same symptoms. She's another non-layer, but I really don't want it to spread to my layers! She is a little lethargic and has yellow diarrhea on her bum. She is still eating and a bit active, but I still quarantined her. Also, her feet are a little scaley which I didn't notice on the first hen (which I may have overlooked). I looked at her skin and it looks white and I didn't see any bugs. I'm going to deep clean the coop and move the run this week to hopefully avoid further spreading this problem, but I wonder if anyone knows what could be causing it? Also, if it spreads to one of my layers, what could I do about it? Other potentially helpful information: I live in an urban neighborhood so strangers can access the chicken run easily, so foreign matter (i.e. poison) could be causing it. Also I opened a new bag of scratch grains recently. It smells and looks normal but who knows... Thanks for any info or suggestions!