Well just depends on the line Some breed them to be able to sex by wing feather angle and some like mine are breed were females feather out faster them males. With mine all my females will feather out there wings and tails faster and males will not get any tail feathers from long time. It really...
The Above applys to all not just plain BBS but also coppers. Blue just does not breed true meaning blue to blue does not equal just blue chicks. Copper has no change with the statement above.