Well it's quiet, but it is definitely a different sound than the peep they have been making. I believe they are 4 weeks old. We got them two weeks ago today and were told they were about two weeks old then. They seem to be getting some tail feathers and I keep checking to see if one looks more like a drake tail than the other. Do I still have a bit of a wait before I know if I have boys or girls or one of each? Thanks!