when I went out to check on My not so feeling good rooster tonight I sat and listen to my Hens sleep... It was so interesting to listen to them, coooowing, hummming, whistling, and almost like signing. I had a hard time leaving. It was so cool listening to them almost hipnotic (sp) I found myself smiling all the way back to the house and could wait to tell my DH. I could record it and use it as white noise for sleep time for myself I love my birds!!!!