One hen seems to be breathing with mouth slightly open. She does not lay eggs but she is healthy as she eats and drinks normally and she walks around. I have just noticed that when she is breathing her beak opens very slightly every breath she takes. I'm not sure if this is normal but it seems as though the other hens don't do it so wanted to check if she was ok? I am putting some of the global herbs project breathe free ointment in her water soon so that might clear it up.