Australia has a lot of problems with any plant or animal materials. I tell my customers who want to order certain plant materials to go to Australia to just forget it; it will get seized, period. NZ same thing.
I have had more problems with people just not getting something in another country than with duty. One person in the Czech Republic never got anything and when she would go down to the post office to ask about it, they would snicker. They were just stealing all her stuff from the US. I quit sending things there for a long time because of it. Now it is supposedly better.