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Sorry for another lesser vs. greater scaup post.

I observed these on an impounded section of the Merrimack River in Hooksett, NH today.

For me, judging head shape from these photos is tricky. In the flight shot, there’s not much white in the primaries so I’m leaning toward lesser. But I also notice one of the bird’s flanks are much whiter than the other’s. Is there a chance I have one of each species? 

Thank you all for your help!

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When you have an open wing shot such as the first one, the upperwing pattern is diagnostic. White limited mostly to the secondaries and diffuse in the primaries indicates Lesser Scaup.

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