We have to have something to discourage all you Canadians from arriving here with your spanners and containers at the ready!
Source
Then there's the Thylacine, or Tasmanian Tiger which is widely believed to be extinct. This pic is from a film shot in the early 1930s of one of the last ones. There's a reward offered for finding one - there are regular reports of sightings, even on the mainland, but nothing conclusive.
This pic comes from a rather interesting
site on the subject.