My 4.5mo hen stopped eating 4 days ago but has no typical symptoms of illness other than that. She has been keeping her beak slightly open but no noticeable respiratory problems. Feathers, crop, breathing, vent all nomal. No noticeable injuries. She's still drinking on her own a little but I've been syringing water and nutrients 4x a day. Gave her subq fluids yesterday. She's able to stand and will walk a little, but is very lethargic. Had my bird rehabber friend look at her yesterday and she was puzzled -- and she's treated thousands of birds! Hoping someone in the chicken universe has seen this before. Thanks!