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Duck - Wikipedia
Duck | Definition, Types, & Facts | Britannica
Wood Duck Overview, All About Birds, Cornell Lab of Ornithology
Duck - Description, Habitat, Image, Diet, and Interesting Facts
Duck Facts, Types, Identification, Habitat, Diet, Adaptations
Anatidae - Wikipedia
47 Species Of Ducks In The United States (ID, Calls, Season Guide)
Bufflehead Overview, All About Birds, Cornell Lab of Ornithology