General terms:
* Australian fauna: This is a more formal and scientific term that encompasses all animal life in Australia.
* Australian native animals: This emphasizes that the animals are indigenous to Australia.
* Aussie wildlife: This is a casual and informal term commonly used by Australians.
More specific terms:
* Marsupials: This refers to the iconic group of mammals found in Australia, like kangaroos, koalas, and wombats.
* Monotremes: This refers to the unique group of egg-laying mammals, like the echidna and platypus.
* Endemic wildlife: This emphasizes that the animals are found only in Australia.
The best term to use depends on the specific situation and audience. For example, "Australian fauna" might be appropriate for a scientific paper, while "Aussie wildlife" might be better for a casual conversation.