Size: L: 14 cm. Wt: 15-18 g. Males and females are dimorphic in colour.
Male: plump body; large, dark eyes; head and underparts golden yellow; white undertail coverts; back, wings, and tail blue-grey, tail with white patches; bill narrow, pointed, black; legs black
Female/Juvenile: similar to male, but head and underparts duller
Nestling: altricial and downy; skin reddish-orange; gray-brown down on head, back, wings, and thighs; mouth red