I think it's worth mentioning that many facilities keep Australian reptiles or birds in their dedicated reptile or bird exhibits, as opposed to including them in a dedicated Australia area. There are frilled lizard, kookaburra, little penguins, frogmouth, and even cassowary that have been held at zoos in areas without any biogeographic link to these species. Marsupials are usually not entitled to this kind of benefit besides isolated walkabouts, large macropods in hoofstock yards, and in the past some small mammal houses, although that entire breed of building seems on the way out.