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Setophaga (Dendroica) coronata auduboni
The summer male Audubon's warbler has a slate blue back, and yellow crown, rump and flank patch. It has white tail patches, and the breast is streaked black. The female has a similar pattern, but the back is brown, as are the breast streaks. (I think the one in the spotting could be a female.) This form is distinguished from the myrtle warbler by its lack of a whitish eyestripe, its yellow throat, and concolourous cheek patch.
Trees next to Tenaya Lake, Yosemite NP, CA.