White-throated Sparrow (Zonotrichia albicollis) 13 December 2014 - Pacifica, San Mateo County, California. Photo © 2014 Joseph Morlan

An uncommon winter visitor to California, this is one of two hanging out in our yard. This individual is probably a white-striped morph. This species does not cleanly separate into tan and white striped morphs in the winter. The strong bimodal plumage pattern is normally expressed only in the breeding season. In the winter there is more of a continuum of variation, possibly to facilitate flock cohesiveness. More information. However this bird already has more white in its supercilium and less ventral streaking than seen on most adult tan striped morphs.. I believe it will lose the slight tan tinge by Spring.

Nikon Coolpix P510 Point and Shoot through window
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