You've probably seen illustrations of the square kookaburra trial
pennies and halfpennies of around 1919/1920, but I stumbled across
some later trials and patterns recently while at the National
Archives, London. There's a koala halfpenny, a koala sixpence, and
also an emu sixpence, all illustrated if you click on the link below:
http://www.worldofcoins.eu/forum/index.php/topic,11873.0.html
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Earlier, in 1926, there were some other trials: some wildlife, some
not, but again well illustrated here:
http://www.worldofcoins.eu/forum/index.php/topic,11939.0.html
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Incidentally, the Australians have told me not to write "koala bear":
it's just koala, as it's not a bear - that's just an example of
convergent evolution, apparently. I stand corrected.
So, see what might have been down under: enter the Antipodean
numismatic Twilight Zone!
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Anyone who likes this sort of thing should have a look at the
unrealised designs board:
http://www.worldofcoins.eu/forum/index.php/board,93.0.html
Phil.