I have three chicks, one blue maran and two black copper marans. They are around 4 weeks old, but may be days apart from each other with the blue chick being the youngest. I have had them since they were days old. I am almost certain one of the black copper marans is a roo. I was hoping to have a female of each breed, as my neighbors would probable frown upon me having a rooster. I think the blue maran is a roo as well, as I had witnessed the black roo and the blue maran bumping chests and pecking at each other, as if in a power struggle. I am hoping to get any insight in the experience of behavior of the sexes in young chicks. Thanks so much for your insight. This picture was taken about a week ago, and the comb on the black maran in the middle/back is considerably larger than the other two.