My aracauna mix hen has started making a really weird sound that she usually doesn't make, when she exhales she makes a sound that sounds to me like moaning almost, it's a really long "oerrrrrr" kind of sound and when she clucks it sounds more harsh and raspy than usual. I'm not sure if she is making the sound on purpose or if when she exhales the air is going past her vocal cords or something. She seems fine other than that, could it be a respiratory infection or a cold or something? 
