How does the general sexual dimorphism in swans compare to that found in ducks?

Answer

Swans generally display less obvious sexual differences in plumage.

Unlike ducks, which often show extreme sexual dimorphism, swans generally have less obvious differences in plumage, although males (cobs) are typically slightly larger than females (pens).

How does the general sexual dimorphism in swans compare to that found in ducks?
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