There are recognizable differences in these three species of wigeons found mainly different regions of the world. The one physical trait that remains similar is the bill color of the three, and both the males and females of the three species have this common trait.

Another interesting fact is that the rusty-headed Eurasian wigeon turns up as a rarity in flocks of American wigeons on occasion, but American wigeons also turn up in Europe in flocks of Eurasian wigeons.

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