Making sense of the Fox Sparrow complex (UNDER CONSTRUCTION)
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 Gallery: Denny Granstrand's Digiscoped Photos  Album: Making sense of the Fox Sparrow complex (UNDER CONSTRUCTION)   
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Most subspecies of Thick-billed Fox Sparrows are the only FOSPs with all-gray bills. The upper and lower mandibles are about equal depth at the base. All other FOSPs have bi-colored bills with the upper mandible being much deeper than the lower.

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 Gallery: Denny Granstrand's Digiscoped Photos  Album: Making sense of the Fox Sparrow complex (UNDER CONSTRUCTION)   
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