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Liasis dubudingala
https://australian.museum/learn/australia-over-time/extinct-animals/liasis-dubudingala/

Liasis dubudinala is the largest snake known from Australia, estimated to have been about 9 metres in length. The only known specimen of Liasis dubudinala was found at Bluff Downs in northeastern Queensland, and is Pliocene in age (about 4.5 million years old)

Diprotodon optatum
https://australian.museum/learn/australia-over-time/extinct-animals/diprotodon-optatum/

Diprotodon optatum

Murgonemys braithwaitei
https://australian.museum/learn/australia-over-time/extinct-animals/murgonemys-braithwaitei/

Murgonemys braithwaitei, known from a nearly complete shell (carapace), was a trionychid (soft-shelled) turtle and the oldest trionychid from the Southern Hemisphere.

Silvabestius johnnilandi
https://australian.museum/learn/australia-over-time/extinct-animals/silvabestius-johnnilandi/

Silvabestius johnnilandi was a rare, sheep-sized diprotodontoid marsupial, one of the smallest and most primitive discovered to date. Silvabestius would have been a browser, feeding on leaves, stems and other soft parts of plants.

Perameles bowensis
https://australian.museum/learn/australia-over-time/extinct-animals/perameles-bowensis/

Perameles bowensis, from the Pliocene of New South Wales, is one of the oldest and most primitive of the Peramelidae, the family to which most Australian bandicoots belong.

Riversleigh Rainforest Koala
https://australian.museum/learn/australia-over-time/extinct-animals/nimiokoala-greystanesi/

Nimiokoala greystanesi was a small koala from the early Miocene of northern Australia. It had a longer snout than the living koala but was only about a third of its size. Nimiokoala is represented by a well preserved skull, a significant discovery since koalas are rare in the fossil record.

Pseudomys vandycki
https://australian.museum/learn/australia-over-time/extinct-animals/pseudomys-vandycki/

Pseudomys vandycki

Trilophosuchus rackhami
https://australian.museum/learn/australia-over-time/extinct-animals/trilophosuchus-rackhami/

Trilophosuchus rackhami was a small mekosuchine crocodile from the early Miocene of northern Australia. It had a short, deep head, large eyes and three longitudinal ridges along its skull (giving it its name).

Stirton's Thunder Bird
https://australian.museum/learn/australia-over-time/extinct-animals/dromornis-stirtoni/

Stirton's Thunder Bird

Baru darrowi
https://australian.museum/learn/australia-over-time/extinct-animals/baru-darrowi/

Baru darrowi, a massive crocodile from the Miocene of northern Australia, was one of the largest of the mekosuchines, an extinct group of Australasian crocodiles. Although about as large as the living Saltwater Crocodile, Baru may have been more terrestrial in its habits.