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Mallards frequently interbreed with the American Black Duck, Northern Pintail and geese species, leading to various hybrids. This variety was very much larger than a common mallard duck, looking much more like a goose in size.

Mallards frequently interbreed with the American Black Duck, Northern Pintail and geese species, leading to various hybrids. This variety was very much larger than a common mallard duck, looking much more like a goose in size.