That's why I put a leg ring on the one that I had come out of a celadon egg. I'm hoping it's a hen.i believe that bobs can be sexed by the feathers on their head?? I personally have zero experience with bobs, but @007Sean and others may be better able to answer that question. The “blue egg” chick will be a carrier of celadon gene and if female may or may not lay celadon eggs. I have hatched a few but do not know which chicks were from those eggs as they can basically be any color and get “lost” in large hatches.
