Gadwalls (Mareca strepera) are common and widespread dabbling ducks in the family Anatidae. Gadwalls were first described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae. DNA studies have shown that it is a sister species with falcated ducks; the two are closely related to the three species of wigeons, and all of them have been assigned to the genus Mareca.
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