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Eurasian x American Wigeon (hybrid) - eBird
American wigeon - Wikipedia
Hybrid Duck Study: HYBRID GALLERY - 2013 - Blogger
American Wigeon Identification - All About Birds
American Wigeon x Mallard (hybrid) - eBird
American Wigeon - All About Birds
American Wigeon | Audubon Field Guide
American Wigeon - BirdWeb
American Wigeon x Mallard (hybrid) – Birds of Nebraska – Online