samouw ~ Birchen is a color pattern. The chicks pictured are Silver Birchens. Black Coppers are birchens too, although instead of calling them "Gold Birchens", they are called Black Coppers. While the chicks are too young yet to show the full pattern, they will have silver hackles and saddle feathers, instead of copper. Hope that made sense, only one cup of coffee so far!
luckily my ladies won't have any of the saddle feathers...I'm still so thrilled with them and they are growing like weeds!