4 week old chicks. Was told the black one is a black sex linked pullet. Have no idea what the other dark colored one is. Thoughts on both chicks? Bought them at a feed store and all are supposed to be pullets, but I know I have one roo that is one of my Delawares . Breed and sex for both? Breed and sex for the 2 darker chicks? Breed and sex? Breed and sex? Breed and sex? Breed and sex? The tail to the Left of the photo is the other supposed Black sex link I have. Both are supposed to be pullets, but this one has a larger comb and shorter tail. Does that mean its a roo? Are they even black sex links or something else? Breed? Sex?