Well, taking that idea a step further, I have seen a few male Northern Shovelers with limited "white-face-crescents" (they were barely present in the birds I can recall). Birds of North America states (for Alternate I, male NOSH)
Head and neck black with iridescent green medially. Some birds show a partial white crescent on face similar in shape and location to that found on adult male Blue-winged Teal.
Here are a few examples of birds displaying varying amounts of this
Maybe there is a white-face-crescent gene hiding in Northern Shoveler.
Sean Walters
Fort Collins, CO
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