The Horned Grebe in the first photo is molting from nonbreeding plumage to breeding plumage. The yellow patch behind its red eye is starting to form and its cheek is turning from white to black. You can see the rufous color starting to form on its neck. The flanks of the grebe have not started to turn the rufous color of the breeding plumage.
In the second photo, you can really see the yellow patch behind the eye of this Horned Grebe.
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