"The Campbell duck is a light weight bird that
on average weighs 4 to 4 1/2 pounds. They are active, streamlined birds with a modestly long head, bill, neck, and body, and a sprightly body carriage of 20 to 40 degrees above horizontal (Holderread, 2001). There are four color varieties of Campbell ducks in North America:
Khaki, White, Dark, and Pied, with Khaki being the only one recognized by the APA. The Khaki drake has a green bill, rich dark-orange legs and feet, and dark brown eyes. Its head, upper neck, lower back, and tail culverts are brown-bronze while the rest of the drake's plumage is a warm khaki. The Khaki duck has a green bill and dark brown eyes and its legs and feet are brown. The ducks head, upper neck, and lower back are seal-brown and the rest of the plumage is khaki. Dark Campbells, developed in Europe in an attempt to provide sex linkage, are a darker version of the Khaki.
The White Campbell, bred as a "sport" variety, is pure white, with vivid orange legs, feet, and bill. (Batty, 1985) The Pied has fawn plumage."
https://livestockconservancy.org/index.php/heritage/internal/campbell