The Coscoroba swan from South America, the world's smallest swan, has features more like a goose than a swan.
Male and female have similar plumage and features.
A red bill and white plumage except for black wing-tips visible in flight (see below).
The Coscoroba swan also imitates other birds: here its impression of a flamingo . . .
. . . and here an impression of a cormorant (shame about the ugly clipped wing).
How to keep white plumage white . . .