Black Stars, sometimes simply called Stars are "sex link" chickens, meaning they're bred specifically so that males and females are different colors when they hatch. They are a crossbreed that was specifically bred to produce a large number of eggs. Adult hens and roosters of the breed look very different, with the hens being black with gold or copper tints, and the roosters black with white barring, and having a close resemblance to Barred Rocks, although Black Star roosters are usually slimmer with much more black (they have the appearance of being a black chicken with silver stripes).
The roosters also have gold highlighting on their hackle feathers. Black Star chickens are first-generation hybrid chickens, bred by crossing a Rhode Island red rooster with a Barred Rock hen, or vice versa.