From a reddit comment..

The guy seriously knows his Australian ecology.

I'll list out some of the amazing detail on flora and fauna he's put in there starting from the Allocasuarina littoralis tree the Black Cockatoos are sitting on. It's one of their favourite foods.

The frogs are probably Peron's tree frogs (Litoria peronii) based on the eyes and calls

Then the Angophora tree has the leaves in the right place

The spider orchid (Caladenia sp) in the grass

The waratah and sickle fern (maybe) in the possums hat

The old man banksia (Banksia serrata) as you stated

There's a lot more, but that's what stuck out to me. The guy's really done his homework while making that.

Not surprising, Cockys are very smart birds.

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Looks very much like a Sulphur-crested Cockatoo, which you can occasionally spot flying here in Aus.
Very smart birds

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Siblings?
http://videosift.com/video/Cockatoo-mimics-an-arguing-couple

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What if you woke up to your cockatoo dancing on the keyboard tablet to his rendition of a Chopin etude?

*wings

I hope the cockatoo didn't scratch that lappy's screen!