Sorry to have jumped on this thread so late... but I am actually tracking the Peep-Cluck chang-over... I have six chickens, and obviously they will do it at different times, but the overall average is going to close. Right now, our chickens are approx. 7 weeks old and they are beginning to sound like a 13 yr old boy's choir. As they peep, in walks a stranger called cluck and it jumps out. I think in a matter of two more weeks, clucking will become more prevalent. It is funny the two Buff's I have are silent, accept when I try to pick them up. Silence becomes screams of fear and terror, but they are still Peep-screams...