Tonight it looks as though I am losing a third hen. We just lost one last night, and one 2 weeks ago. The first and this one ( Buff, and an Aricauna) were quite sudden. The birds were fine all morning/day, then suddenly became lethargic and unresponsive to being picked up. The first died, and I don't believe this one will get through the night. They look normal. Not sure what their poop looks like, or if their eating, as it didn't look like a pattern and I didn't isolate until now. The second bird became slightly lethargic a few weeks ago- she seemed smaller than the others, with paler skin around eyes and face (Speckled Sussex). What should I look for? What can I do??