Came across this grainy photo from eighteen months ago taken in the Riverland,SA.
Initially thought Nankeen Night Heron but now a little unsure.
Nankeen ot Little Bittern?
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No expert but I think it is Nankeen Night Heron. Just from a brief look around. Also: "http://www.birdlife.org.au/documents/AB-albguide.pdf" Has pictures of male/female of Little Bittern. Female looks more like your photo but has yellowy bill whereas Night Heron's have an olive-green bill (I'm pretty sure).
Also it says Litle BIttern's are rarely seen in the open. Anyway wait for others to confirm!
Yep its a Nankeen Night Heron.
Thanks Owl,Tim.