I rescued two Barnvelders about 6 weeks ago, I estimated their age to be about 8 weeks (although I was told they were 10 weeks). Anyway I have been wondering, never having raised such young birds before, when do they stop making the chirping sound and start to cluck like adult chickens? I have had them (Milly & Molly) six weeks so I estimate that they are now 14 weeks old. They are in a separate pen alongside my Copper Black Marans and some hybrids in their own pen, the young Barnvelders go head to head with the two other dominant hens and they don't back down, in fact it is the dominant hens who back away, it maybe be because they are safe in their pen. So funny to watch though.