A second head.
Custom Trait Information: Can edit the poses of both heads. Does not have to be the same angle or expression. Can have the same or different traits or markings, as long as one or the other head shows the markings and they're legal. (For example if the geno has Masked, only one head has to have masked, but if both have it it has to be legal on both. Likewise if they have Unicorn Horn only one head has to have the horn, but both can too.) Neck lengths have to be about the same width and length, and the regular traits have to be the same (Unless spliced).