Ring-necked Duck x Scaup hybrid

Another New Haven Harbor hybrid Aythya, amongst a wintering mixed scaup flock. I have seen this bird three times, initially on January 19th. Trying to figure out the scaup species involved is a bit of a headache. In the field I certainly found the bird to give more of a Greater Scaup-like vibe, based on body, head, and bill shape & size, for what it's worth. However it has been hypothesized that the mediocre open-wing photo is pro-Lesser, as the obvious white is restricted to the secondaries, but I'm not convinced that is anything more than suggestive. All criteria seem shaky.

Click for larger images:

Hybrid's head shot pasted between GRSC and LESC for comparison (identical lighting conditions). Not to scale (hybrid's head is magnified). Vibrance kicked up a few notches to accentuate head color.

Older pics, with Greaters, from back in January:

 - Nick


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