UPDATE: Re: Hybrid Aechmophorus grebes; Clark's x Western
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Kevin Zimmer has contacted me separately with his thorough review of my photos:
By the way, in looking at your photos, I’m not at all convinced that you have a mixed-species pair. The bird on the left has a typical orange-yellow bill for a Clark’s, and although the black feathering of the crown comes farther down on the face than it does on its mate, the bottom of the eye is still bordered by white feathering. That’s how many Clark’s Grebes look in winter, and could be indicative of a sexual difference. A Western Grebe should have dark feathering below the eye, and the bill should be greenish-yellow, with an extensively dusky culmen. At best, the bird on the left is a hybrid, but I would still vote for it being a Clark’s Grebe.
On Sat, Aug 15, 2020, 14:21 Mike Bush <mbushii@...> wrote: