Merginae

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Sea Ducks
Harlequin Duck, Histrionicus histrionicus (male)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Subfamily: Merginae

The Merginae or sea ducks are a subfamily of the Anatidae, the duck, goose and swan family of birds.

As the name suggests, most are marine outside the breeding season. Many species have specialized salt glands to allow them to tolerate salt water, but these have not yet developed in young birds. Some species prefer riverine habitats.