I have three two week old Blue Orp roo x Delaware hen chicks. Two had head spots, I understand they are cockerels. One of those is growing in barred feathers, so will have the cuckoo pattern and one is very light blue. The third chick looks black, does not have a head spot, so I am assuming it's female. However this weekend I noticed BROWN barring or spotting coming in on her shoulders. Any ideas as to who/what/why?