This is an interesting point because I would definitely count things like koalas, wombats and cockatoos as ABC species in Australia. They're the type of thing that everyone (in Australia at least) has heard of from a young age, would expect to see when they go to the zoo, and are present in nearly every collection. That pretty much sums up an ABC species but in America, for example, koalas probably cause quite a stir.
Cockatoos are pretty ubiquitous here in the UK. Of the other two animals you name, there are only 4 collections with wombats in the entirety of Europe, and only 7 with koala.
A lot of your ABC's are scarce or completely absent in the Northern Hemisphere in general, to be honest.