None of mine crow as early as 10 weeks, thank goodness. I will be glad when the man collects them, as they are driving me (and the neighbours probably) mad with the noise and squabbling. I have tried all ways to shut them up in the sheds, but they crow standing up, sitting down, and probably upside down too if I held them that way!! I have blacked out the windows, but no use, once dawn comes they are off with a loud chorus that echos down the valley!!