Hi, I am new here. We just had a bantam chicken die this morning. She did not appear to act like her usual self yesterday, lethargic and vommited and today she was just trying to sleep this morning. She died shortly after that. We now have a speckled sussex just start acting lethargic today and almost seizing when she vomits. Her breast is soft and warm to the touch. What could be causing this!?