See also Fox Sparrow red (Tiaga) race, sooty (Pacific) race. and thick-billed race.
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Fox Sparrow – slate-colored race
Black Canyon of the Gunnison NP, CO
April 13, 2015 ©John Schwarz
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Fox Sparrow – slate-colored race
Black Canyon of the Gunnison NP, CO
April 13, 2015 ©John Schwarz
John, the birds pictured from the Entrada burn in Bend are Thick-billed Fox Sparrows of the fulva subspecies. Notice the horn-colored bill. Slate-colored Fox Sparrows breed significantly farther east in Oregon.
Tom, you are entirely correct, and thank you very much for noticing and pointing that out. The Thick-billed Fox Sparrow will be getting its own page on the web site. The funny thing is I spent some time especially looking for this subspecies in California, not realizing I had actually earlier found it in Oregon!