Has been included in P. hasitata. Commonly treated as conspecific with P. phaeopygia, from which it has been considered doubtfully distinguishable, but differs in somewhat different dimensions#R, with shorter tail (effect size −1.25, score 1) but longer tarsus (effect size 3.5, score 2) (total 3); extent of dark cap (cutting away more beneath cheek vs diagonal line down from cheek onto neck side) (2); little or no vs extensive dusky smudging on axillaries (1); slightly broader dark trailing edge of secondaries (1); usually entirely white forehead (ns); usually narrower bill (ns[1) (all non-mensural characters from published data#R); 6−7-syllable call, “goo-oooo-gouih-gouih-gooo-o”, as against 3−4-syllable “kee-kee-kee-o” (difference considered “marked” and “important”#R) (allow 3). Genetic evidence supports this split#R#R. Monotypic.
C Pacific Ocean, breeding in Hawaiian Is (Hawaii, Lanai, Molokai, Kauai, Maui and almost certainly elsewhere).
Food and feeding
Status and conservation
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