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Passerella iliaca unalaschcensis
The Sooty Fox Sparrow contains the darkest-colored taxa in the genus Passerella. It is currently classified as a "subspecies group" within the Fox Sparrow pending wider-spread acceptance of species status. It has long been suspected to be a separate evolutionary lineage due to morphological distinctness, and this is confirmed by analysis of mtDNA sequence and haplotype data. This group appears to be most closely related to the Thick-billed and/or Slate-colored Fox Sparrows. The Sooty Fox Sparrow complex varies clinally in intensity of color. The upperparts and head are a variable shade of brown with streaks on the underparts of the same color. The northernmost birds are a sandy brown while southernmost birds are a dark coffee-like color. Sooties prefer to breed in willows and alders at the edge of wet habitats.
Thicket by lake, Stanley Park, Vancouver, BC.
Liam & Cynthia, thank you for your help! I'm not very good with these LBJs, so I'm happy I wasn't too far off the mark this time!
(Sooty) Fox Sparrow (Passerella iliaca unalaschcensis). The arrow-shaped spots on the breast are a good field mark for Fox Sparrow. Hermit Thrushes have rufous on the tail.