These chicks are 3 weeks old in the pics. I can see very little difference in the the chicks combs. One chick is developing a very pronouced triangular barring on its back - - - does that indicate a roo or is it just a Fluke?The chick in the lower right corner of the photo has lots of the barring. The chick right above it has a little barring but not as much the chick who I cut off part of the body with the camera I am wondering if I hatched all pullets since I can not see any big differences in the combs at this point in time . . . . . What do you think ? ?