Doesn't look like an emu to me, Emus have thin wispy feathers, that looks quite different to those of most other birds. This looks more like a the rear end of a bird in flight, I believe I can see the curve of the left wing, and the barred underside of a tail. Not sure if I can make out blue on the wing, hard to tell with the shadow, but maybe a kookaburra?
It's an immature, they can be quite similar to other Robins, but I think the lack of white forehead spot eliminates Scarlet (most similar) - also Red-capped would be most likely given location. For example see a nearly identical bird: https://macaulaylibrary.org/asset/121876441
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