Hello, I am new to chickens and we have six of them right now all about 4 weeks old. My husband bought two black sex links from tractor supply and one was a little larger and acted differently than the other from the very beginning - she was taller, seemed to always know what’s going on, paying attention to us when we’d approach them and talk to them. She’s been my favorite. However her feathers are different now at four weeks old from the other black sex link we have. The other is very shiny black with reddish brown feathers. This girl is black and white and taller. We’re wondering if she’s a black sex link at all? Or maybe she’s a rooster? We’re new to this so any help would be great. Thanks!