It is a hyrid of Mallard / Gadwall ,which is known as a Brewers Duck.
In form and proportions this bird is very nearly allied to the Mallard, from which it differs in having the bill considerably narrower, in wanting the recurved feathers of the tail, in having the feet dull yellow in place of orange-red, the speculum more green and duller, without the white bands of that bird, and in the large patch of light red on the side of the head. It may possibly be an accidental variety, or a hybrid between that bird and some other species, perhaps the Gadwall, to which also it bears a great resemblance.
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