Can you get better pictures of them? Where did you get them? Black Copper Marans and Black Sex Link pullets look a lot alike, especially hatchery Marans. Marans often have feathers on their feet, are usually bigger than BSLs, and the red feathers are usually confined to the neck area. Black Sex Links usually have clean feet, and often have a lot of red in the feathers on the chest. There is always the egg color of course, Marans hopefully lay much darker brown eggs.