I may be mistaken but every native, Australian mammal is a marsupial.
Not sure about that, but I know Australia is home to some rather odd critters! (No, I'm not talking about FReepers :)
Animals like the egg-laying duck billed platypus and the spiny anteater.
Both of them are mammals, but I can't remember if they're marsupial or not....guess I need to Google it!
Even the indigenous humans??