Socorro Island, northwestern Mexico.
Recently argued to be a separate species from S. pitiayumi in study that found it is genetically (though not morphologically) closer to S. americana#R. Differs from latter in its lack of pale chestnut on breast (2); yellow vs white belly (3); reduced white markings in both wing and tail (2); much less contrast in upperparts and on face (although some individuals retain dark on lores and around eyes; ns); and notably longer tail (mean of 6 males 46·3 vs 40 mm in 10 americana; allow 2). Differs from S. pitiayumi, including geographically and morphologically closest race insularis, by its more extensive but duller yellow on underparts (1); duller, olive-tinged upperparts, producing much less contrast between grey nape and olive-green back (1); greatly reduced white spotting on tail (2); slightly longer bill and tail (mean in tails of 4 male pulchra 40·3 mm and of 4 male insularis 42·5 mm; allow 1); and evidently more complex voice, involving several songs, resembling those of S. ruticilla, S. pensylvanica and S. americana#R (allow 2); but more research needed. Monotypic.
Socorro I and Revillagigedo Is, off W Mexico.
Food and feeding
Status and conservation
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