There are lots of Austrailian laws that prevent the exportation and importation of animals....most stem from declining natural populations and invasive species problems (freakin rabbits and toads)....that is why you will never see WC austrailian animals around....and if you do, they are probably here illegally.

Here is a good read:

http://www.comlaw.gov.au/ComLaw/Legi...der%202004.pdf