I have 2 Black Copper Marans that are about 4 weeks old. I’m thinking the chick in the 1st two pictures is a roo but it does have longer tail feathers that the other. The first one is also a little bigger in size and as you can see his comb is bigger. I guess that one having longer tail feathers than the other is throwing me off because I always heard roosters take longer to get tail feathers.