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Scaup, Greater and Lesser?

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I was going to post this photo under “Sexual dimorphism in Birds”  as male & female Greater Scaup. Or do I have a male Greater and a Lesser? Seen in May at Reed Lake SK. 


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I too would have thought the middle scaup was differente.... head seems smaller - less of a forehead and eye differently placed in head - BUT it may all be camera angle and would not disagree with BirdNuts

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