I have a pair of buff laced Polish. The pair have been in the same pen exclusively for several months now, and no other roo has been in the pen. I had some eggs hatch today. The first four chicks came out the expected buff color, but this last chick hatched completely black! Is this a normal thing that happens on occasion with buff laced? This is the first time I've ever hatched any, so I had no idea I could end up with an odd colored chick.