The Coscoroba Swan, native to 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.
The Coscoroba swan also imitates other birds: here its impression of a flamingo.
Size comparison with Muscovy Duck.
How to keep white plumage white . . .