I have two chicks about 6 weeks old. One is a barred rock and the other is a rhode island red. I am assuming they will be roosters, because I have noticed their combs and wattles to be growing quickly and they started to "chest bump" each other. They seem to get along fine right now, but is there any other signs to look for that will confirm the possibility of them being roosters? I have noticed the barred rock looks lighter in color, more white than black.