Size: L: 13 cm. Wt: 9-11 g. Males and females are dimorphic in colour.

Adult Male: upperparts dark olive, with broad, black facial mask; underparts whitish or yellowish, with yellow undertail coverts and buffy flanks; bill narrow, pointed, blackish; legs bright orange

Adult Female: upperparts dark olive, with olive face, and small, pale yellow eye ring; underparts whitish or yellowish, with yellow undertail coverts and yellowish flanks; bill narrow, pointed, blackish; legs bright orange

Juvenile Male: upperparts dull olive, with dark olive face, and yellowish eye ring; throat, upper breast, and undertail coverts yellow; lower breast and belly whitish to dull yellowish; bill and legs as in adult

Juvenile Female: upperaprts dull olive, with olive face, and small, pale yellow eye ring; underparts pale olive, with yellowish undertail coverts; bill and legs as in adult

Nestling: altricial and downy; skin light orange; dark gray down on head, lowerback, and wings; mouth red; gape flanges yellow