Male is a distinctive, long-billed sunbird with iridescent purplish-blue throat, yellow breast and belly, and diagnostic bright orange patch on chest. Female is grayish-olive with a yellow eyebrow and dull yellow underparts. Singles or pairs can be found in lightly wooded areas, forest edge, and plantations within lowlands and low hills. Confined to the island of Sumba. Female has a thinner, longer bill than female Brown-throated Sunbird, and further differs in presence of yellow eyebrow. Gives a very high-pitched undulating, warbling song. Calls include “tzit” and “tew” notes and a repetitive “weet-weet-weet…”.