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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.

Kronosaurus queenslandicus
https://australian.museum/learn/australia-over-time/extinct-animals/kronosaurus-queenslandicus/

Kronosaurus queenslandicus

Phoeniconotius eyrensis
https://australian.museum/learn/australia-over-time/extinct-animals/phoeniconotius-eyrensis/

Phoeniconotius eyrensis

Tingamarra Alamitophis
https://australian.museum/learn/australia-over-time/extinct-animals/alamitophis-tingamarra/

Alamitophis tingamarra was a small Eocene madtsoiid, an extinct family of primitive snakes known mainly from Gondwana. Madtsoiids have the longest fossil record of any group of snakes, with a record that stretches from about 90 million to 100,000 years ago.

Genyornis newtoni
https://australian.museum/learn/australia-over-time/extinct-animals/genyornis-newtoni/

Genyornis newtoni

Steropodon galmani
https://australian.museum/learn/australia-over-time/extinct-animals/steropodon-galmani/

Steropodon galmani, a platypus-like monotreme from the Early Cretaceous of Australia, was the first Mesozoic mammal discovered from Australia. It is known from an opalised lower jaw with molar teeth found at the mining town of Lightning Ridge in north central New South Wales.

Paljara tirarense
https://australian.museum/learn/australia-over-time/extinct-animals/paljara-tirarense/

Paljara tirarense was a small ringtail possum (family Pseudocheiridae) from the early Miocene of South Australia and northwestern Queensland. Ringtail possums were once much more diverse than they are today, distributed across many now-dry parts of Australia that were forested during the Cainozoic.

Nimbacinus dicksoni
https://australian.museum/learn/australia-over-time/extinct-animals/nimbacinus-dicksoni/

Nimbacinus dicksoni was a small, fox-sized thylacine, a carnivorous marsupial distantly related to the 'Tasmanian Tiger' (Thylacinus cynocephalus). Thylacines were the main mammalian predators of the Miocene.