I have 10 BR hens, a BR Roo & a BO Roo that love to sing the egg song! I am fairly new to all this chicken biz and was really shocked to hear the Roos singing even louder than the hens. It is awesome, my whole back acre sounds like a major choir practice and they can carry on for quite a while. I love it!!!!! But due to the heat, it has slowed down a bit.