. Basal upper ridge of culmen broadly flattened, gape wide, tail slightly graduated. Male nominate race has bulbous narial wattles (bilaterally bifurcate) and bare skin over mandible bases pale, chalky turquoise-green or yellow; lores and side of face dark brown, crown similar but with coppery-green sheen; nape, mantle and upper back honey-brown with darker feather tips, washed iridescent coppery yellow, lower back and rump pale silky iridescent sulphur-yellow; tail and upperwing and its coverts honey-brown, darker tips on primaries, secondaries and rectrices; malar area and entire underparts silky or glassy sulphur-yellow; thigh feathers dark brown; iris dark brown; bill blackish, mouth dull-coloured (lacking bright pigment); legs blackish. Female is slightly larger than male (uniquely within family), lacks wattles, and has different plumage, dark olive-brown above with cinnamon-brown on exposed wings, and paler, more yellowish-buff, underparts with darker streaking, especially on breast. Juvenile undescribed, possibly briefly grey; first-year immature dark olive-brown above, washed amber on wing and tail, lacking yellow, underparts cinnamon, dark feather edgings on breast forming broad greyish streaking, belly pale greyish; second-year plumage of both sexes like adult female, but darker below and less yellow above; tail of immature male longer than adult's, progressively shorter with age, wattles require at least a year to develop fully, changing from black, to black mottled with turquoise-green, to adult male colour. Race aurora male is fractionally larger than nominate, more so in tail length, and upperparts significantly brighter (paler), more brown-yellow, crown far paler and more greenish, less brown, narial wattle pale blue.