Thanks everyone for your replies, this is what we were thinking as well since Yellow has a redder and slightly more prominent comb than the others. We were worried about Olive as well since s/he looks very similar to Vocal except for the comb, which is like a smaller version of Yellow's. It's...
We have four ameraucanas (not easter eggers) whose genders we're uncertain of. We have guesses but this is our first time hatching chicks so we'd be glad to get more opinions. The eggs were from black, blue, self blue, and splash ameraucanas. They are all a few days shy of 10 weeks old.
Thanks...