Isla Guadalupe, Baja California.
Usually treated as conspecific with J. hyemalis, notably resembling J. h. mearnsi, but differs from all taxa in the hyemalis complex by its bluish-white vs pinkish bill (2); larger, longer bill (allow 2); shorter wings and tail (allow 1); evidently distinctive song#R, with significant differences from both J. hyemalis and J. phaeonotus in number of different syllables (3), maximum frequency (ns), minimum frequency (ns) and number of repeated elements#R (3); and from the morphologically closest form J. h. mearnsi in its slightly darker grey crown and (usually) breast (1); white of belly duller and smaller in area (1); genetic evidence indicates a long separation from both J. hyemalis and J. phaeonotus#R (vocal evidence places it closest to J. bairdi). Monotypic.
Guadalupe I, off NW Baja California (NW Mexico).
Food and feeding
Status and conservation
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