Hi! We have 3 buff Cochins and 1 blue Australorp, they are about 6-7 weeks old. We think that the Australorp is a roo, but are not sure about the Cochins... Any help would be greatly appreciated. Thanks! Chicken no. 1 Chicken no. 2 Chicken no. 3 Chicken no. 4 really hoping that this one is a girl, as she is so sweet!