Well this morning just proved that you never know what you will get when hatching chicks. I had a chick from 2 black d'uccle parents hatch out that is blue mottle. How did this happen ? I can guarantee that no other rooster got in the pen and I don't even have a blue mottle (til now !) I do suspect the rooster comes from a mottle background. He has a white wing tip and a white spot on one foot. It's just the blue color that has me puzzled. I wonder if I'm ever going to understand color genetics.