Nominate race has rather narrow white eyering, dark grey lores; top of head and upperparts dark yellowish olive-green; remiges and rectrices blackish-brown, broadly bordered with olive-green; chin, throat, upper breast and undertail-coverts not very bright sulphur-yellow, rest of underparts satin-white, more greyish in flanks and breast; iris blackish to grey-brown; bill black; legs grey, brown ore blackish. Distinguished from Z. mirror locally either by lack of black in forecrown, or by less bright throat. Sexes similar. Juvenile is similar to adult, but eyering smaller. Races differ minly in size, plumage tones and width of eyering: aruensis is small, with rather wide eyering, deeper dark yellow throat; wuroi is small, greener above than other races, loral line blackish-grey, wide eyering, rather pale yellow throat; wahgiensis is similar to nominate but larger, slightly greener above, rather bright yellow, sometimes has slight yellow longitudinal streak below; oreophilus is similar to previous, but some yellow on forehead and above lores, and has lower half of eyering white and upper half grey; crissalis is more yellowish, less dark green on upperparts, with forehead and supraloral region distinctly yellow; magnirostris is small, with large bill, rather pale yellow, more greenish throat, has yellowish median streak down to belly.