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Lesser or Greater Scaup - Sacramento NWR


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4 hours ago, Charlie Spencer said:

The eye position is a new one on me.  What's the Greater difference?

Thanks.

Quoting Tony Leukering from this:

Eye placement: Though subtle, with experience, eye placement can provide a strong clue as to an individual scaup’s identity. ... In Lesser Scaup, the eye is lower than the mid-point of the head from top to bottom, while the eye of Greater Scaup is above the mid-point. Thus, Lesser Scaup shows proportionately more head above the eyes than does Greater Scaup. However, beware of actively-foraging Lesser.

image.png.7ae235ee5be135499d5a44b86fc8dd65.png

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On 12/4/2021 at 7:19 AM, PaulK said:

Quoting Tony Leukering from this:

Eye placement: Though subtle, with experience, eye placement can provide a strong clue as to an individual scaup’s identity. ... In Lesser Scaup, the eye is lower than the mid-point of the head from top to bottom, while the eye of Greater Scaup is above the mid-point. Thus, Lesser Scaup shows proportionately more head above the eyes than does Greater Scaup. However, beware of actively-foraging Lesser.

image.png.7ae235ee5be135499d5a44b86fc8dd65.png

I knew that, but couldn’t remember which was which. Thanks for bringing this up. 

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