I have 9 chicks that hatched out a little over 10 weeks ago. Because I was going for dark brown and olive colored eggs, I put specific eggs beneath my broody so there are multiple breeds in this gang. Two have been crowing for a couple of weeks but I'm having difficulty believing only 2 out of 9 are boys. A few more look to my uneducated eyes like they may be boys, so my question is, by what age should I expect crowing from boys?