I have a couple of questions about black and blue chickens. Mainly Marans. I have 2 FBCM hens and one rooster. Months later I bought 3 Black Marans and 2 Blue. Ok, the Black Marans...... are they Black "Copper" Marans or just "Black" Marans? The 3 I have do not have an copper feathering around the neck. They do have the green iridescent color in the feathers like the FBCM. How do I know for sure other then egg laying that they are not another type bird like the Austrolorp? Same with the Blue Marans. I've seen other birds in the blue color and it was a different breed. Just questions I'd like to know. Wondering how you would tell the difference if you didn't know the breed. Make sense?