This year's batch had two with black dots on them. It looks like one may be growing out one black feather where one of the dots was.
On a down note, one of my CX is doing poorly. It is a lot smaller than the rest, and this morning I noticed he/she wasn't eating at all. When I examined it, it felt like perhaps the crop was getting impacted. It wasn't super hard, but I could feel some long fiber-like strands, which made me wonder if it had eaten some of the straw bedding, or perhaps got into something string-like in the yard. I massaged the crop as best as I could to try to break it up. I'm going to check on it again in a few hours, but I'm not very optimistic. It takes a lot to put these birds off their food. Rats. It seems like no matter how hard I try to make everything perfect, I always lose a couple birds.