The Regent Bower male resembles the female until he is about 4 years old when his plumage moults and his head, back and flight feathers become coloured in a rich golden-yellow, with the remainder of the bird being black with a purple sheen. Its forehead is sometimes tinted crimson, and it has bright yellow eyes.
The female is coloured in shades of dull brown, olive-brown, and yellow-brown on the upper parts of her body, and pale buff with brown mottling underneath.
Decoration of bowers
The dominant male construct his hidden bower on the forest floor is a single avenue in a tangle of ferns and vines. He paints it yellow, using a mixture of saliva and the juice of crushed leaves. Decorations include snail shells, berries, pebbles and leaves, all of a red-black or yellow-brown colour. Other males may visit and help care for the bower.
Regent bowerbirds live mainly in the upper levels of forest trees and spend time on the ground only when displaying, mating and building or maintaining the bower. Their range extends from the Eungella Range, inland from Mackay in Queensland, to the Illawarra escarpment near Wollongong.
When courting the male fans his tail and spreads his wings, he may also beat his wings to display their brilliant colours while churring, chattering and wheezing.
NSW Department of Environment
Field guide to Australian Birds.
Field guide to the birds of Australia, 6th Edition