People want French Blue Copper Marans chickens because they lay dark eggs, have beautiful feathers, and are docile when they are in a flock. Breeders like them because they are beautiful, useful, and have a unique breed character. Their body feathers are blue, and their hackles are rich copper. The feathers on their legs let you tell the difference between real French lines and fake ones. Many keepers use them for breeding efforts and egg baskets.