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Sooty fox sparrow
The sooty fox sparrow (''Passerella (iliaca) unalaschcensis'') contains the darkest-colored taxa in the genus ''Passerella''. It is currently classified as a "subspecies group"〔Not defined by the ICZN〕 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 (Swarth 1920), and this is confirmed by analysis of mtDNA sequence and haplotype data (Zink 1994, Zink & Kessen 1999, Zink & Weckstein 2003). This group appears to be most closely related to the thick-billed and/or slate-colored fox sparrows (Zink 1996, Zink & Weckstein 2003).
==Description==
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. Beadle & Rising (2003) describe their call note as a sharp ''zitt'' or ''thik'', while Sibley (2000) says it is a loud smack like that of red fox sparrow.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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