Linked from
The 14 pages that link to Waterfowl, each with the reason it gives.
SwanNarrower topic: Swans share the aquatic adaptations characteristic of waterfowl.
Domestic gooseNarrower topic: Geese share aquatic adaptations and ancestry with this broader group.
Harlequin duckNarrower topic: The harlequin duck is a small member of this broader bird family.
Swan gooseNarrower topic: The swan goose is a large, grazing member of this broader bird grouping.
BrantaNarrower topic: Branta's classification ultimately places it among these aquatic birds.
PresbyornisNarrower topic: The genus is known for a waterfowl-like body and feeding ecology.
TadornaNarrower topic: Tadorna belongs to this broader group of birds.
Whistling duckNarrower topic: This broad group includes whistling ducks and their closer relatives.