The standard-bred Rouen drake has a long, finely-formed head, with rich, lustrous green plumage; bill long and broad, wider at the extremity, of greenish-yellow color, with a black bead at the tip; the neck is long, slender, and neatly curved, covered with the same lustrous green plumage as the head, which is interrupted by a distinct white ring, not quite complete behind, on the lower part of neck. The back is long, the upper part being ashy gray, mixed with green, and running into a rich, lustrous green on the lower part and rump; the shoulder coverts are gray, striped with fine, wavy lines of brown. The breast is broad and deep and purplish brown or claret color, perfectly free from gray feathers; the claret color should extend down as far as possible toward the legs. The body is long, deep, and broad, the under part and sides being a beautiful gray, which grows lighter near the vent, ending in solid black just beneath the tail. The wings are short and carried closely and smoothly against the sides; in color the wings are of a brownish gray, interspersed with green, and marked with a band of rich purple, with metallic reflections of green and blue lights, and edged with distinct white bands; the primary feathers are of a dark, dusky brown. The tail feathers are hard and stiff, and of a dark ashy-brown color; the outer edge in old birds is edged with white; the curled feathers are well curled and hard. The thighs are short and stout and of ashy-gray plumage; the shanks are short and strong, and in color orange with brownish tinge; the toes and webs are of the same color as the shanks. The head of the Rouen duck, like that of the drake, is long and finely formed, but with a deep-brown plumage and two stripes of lighter brown extending from the beak to behind the eyes; bill, long, broad, and somewhat flat, brownish orange in color, blotched with darker shade upon the upper part and ending in a black beam at the tip. The neck is neatly curved, long and slender, light brown in plumage, penciled with a darker shade of the same color; unlike the drake, there is no white ring on the neck. The back is long, of a light-brown color richly marked with green; breast, full and round and of dark-brown plumage, penciled with lighter brown; body, long, deep, and broad, the under part and sides of plumage being grayish brown, each feather penciled with rich dark brown to the point of the tail. The wings are short for the size of the bird and are carried closely against the sides; the color of the plumage is grayish brown, intermingled with green, with bars of purple edged with white, the colors being distinct; primaries are brown. The tail feathers are stiff and of a light-brown color, distinctly marked with pencilings of dark greenish brown; tail coverts are brown, penciled with the same dark brown, or greenish brown, as the tail. The thighs are dark brown, penciled; and shanks, toes, and webs are orange or orange brown.