My hen suddenly cant stand up anymore , and it is lying down with its eyes closed! when i saw that , i tot it was her dying moment as she is 6 this year. when she tries to stand , it seems her legs were weak or something , making her unable to stand. And her breathing seems heavy (gasping for air). so i decided to at least let her die outside of her cage , and carried her out . After an hour or so, i put it back in the cage. After 3 hours or so , she stood up ! but her tails are down ( normally its up ) . Then the next day , it became normal again wth eyes wide open. Ahh~ it scared the daylights out of my soul . Can someone explain this behaviour if you know ? another question , how long is the lifespan of a chicken.