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Welcome to Project Noah, Adriani! I agree with Laura, it's definitely a Pied Butcherbird. A great site for identifying Aussie birds is http://www.birdsinbackyards.net/ We'll look forward to seeing more of your photos!
Great find! These guys are always slightly confusing to me, since they look so much like European magpies, but they're called pied butcherbirds :) Looks like this one let you get pretty close! Fantastic :D