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Saw these grebes yesterday on San Francisco Bay. I'm pretty sure they're Clark's Grebes, except I'm a bit confused by the one with the "underbite". It's lower bill extends beyond the upper in the manner of a skimmer. Is this a deformity? Or perhaps an injury?

 

Clark's Grebe.jpg

Clark's Grebe 2.jpg

Clark's Grebe 3.jpg

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Posted (edited)

Bill deformities are not uncommon.  I wouldn't let it affect this identification.

EDIT: please note that I'm not saying this is or isn't a Clark's, just commenting on the bill.

Edited by Charlie Spencer
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Posted (edited)

Clark's Grebe. Note: Mostly white on the flanks, and white around the eyes.

Edited by Kevin
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Posted (edited)

IN my opinion the most robust visual ID mark for Clark’s v Western is color of the bill - Clark’s is yellow with a little orange or red at the base of the lower mandible, Western is a dingy green-yellow

Extent of the dark on the face (does it come down around the eye?) can vary with age and season and in the nonbreeding season many birds look kind of borderline in that regard but can still be IDed by voice and Bill color

Edited by AlexHenry
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