This species was split from G. religiosa on account of its large size#R, a position followed in HBW. Case intriguing, as known differences simply much greater size (on one variable or another at least 3; weight difference likely to be 4) and proportionately much larger white wing-flash (mean length on male closed wing 44.7 mm; apart from G. r. miotera, with 31 mm, no other form surpasses 25 mm; allow 3); but by wide reputation (making it a special target of bird-trappers) also with a much wider vocabulary (ns). Status as a full species therefore borderline, but maintained here on balance of probability when further research undertaken. Monotypic.
Banyak Is (Babi, Bangkaru and Tuangku) and Nias I, off NW Sumatra.
Food and feeding
Status and conservation
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