Spotted Bowerbird (Chlamydera maculata)
A profile photo so that you have a general idea of the plumage... here we can only see a little of the crest on the back of its head.
An interesting text about the species:
"Spotted bowerbirds have a diverse range of vocalisations. Typical calls include loud, harsh churrings and other notes, as well as the complex vocal mimicry characteristic of grey bowerbirds. Spotted bowerbirds are accomplished vocal mimics and have been known to simulate the calls of many birds as well as other sounds.
When approached by humans or other potential threats, males at bowers and females at nests often mimic the calls of predatory birds such as the wedge-tailed eagle, blue-winged kookaburra, grey-crowned babbler, grey butcherbird, pied butcherbird, australian magpie, australian raven, apostlebird and honeyeater, among others.
Other sounds mimicked include large herbivores moving through scrub or over fallen branches, the twang of fence wire, wood chopping, the crack of stock whip and the whistling flight of crested pigeons."
Text from Wikipedia
Cunnamulla, Queensland, Australia