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).
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.