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Not quite sure if this is an Anna's Hummingbird or a Calliope. Pretty sure it's a female, regardless.
Just a combo to show the intergrade characteristics as different from the red-shafted: the red nape patch borrowed from the yellow-shafted, the mixed black and red malar (the black coming again from the yellow-shafted), and the increased amount of yellow in the tail feathers. One more thing, just noticed here and confirmed in Sibley: the more rectangularly-shaped malar seen at left is also a characteristic borrowed from the yellow-shafted. The squirl "Chinese brush stroke" malar at right is typical of the red-shafted.
Seen while bird watching at the Nimbus Dam on the American River in Rancho Cordova, California. All are public domain.