Black Copper (Cuivre Noir)
A variant of Marans (Gallus gallus domesticus)

Representative Maransphoto — a dedicated image of this exact morph isn't available yet.
The most famous Marans color: lustrous black body with coppery-red hackle and saddle feathering on cocks. This is the line selected hardest for the darkest chocolate-brown eggs and is the de facto 'standard' Marans in the US.
Keeper tips for this variant
Buy from a breeder who culls to an egg-color scale (Marans Club 1-9) — color genetics are polygenic, so darkest-egg parents give darkest-egg daughters; egg shade is deepest at start of lay and after a molt.