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Lesser Scaup

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I recently displayed this photo and with the title "Lesser Scaup" based upon the "racing stripe" marking on the duck's bill. Someone suggested that it should be IDed as a Greater Scaup. Since I have limited knowledge in IDing birds, I want to make sure I get it correct. Hopefully someone can nail this down for me. Shot in Cambridge, Maryland, USA on 01-15-2019.

Thanks in Advance,


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This is a Lesser for the reasons Jerry Friedman mentioned, especially the fact that the white wing wing bar is only present in the secondaries, and stops before the primaries. That's diagnostic, if I remember correctly. Head shape is variable and hard to assess in one photos.

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