Based on the list of Australian animals extinct in the Holocene, about 33 mammals (27 from the mainland, including the thylacine), 24 birds (three from the mainland), one reptile, and three frog species or subspecies are strongly believed to have become extinct in Australia during the Holocene epoch.
[citation needed] An online database of threatened mammals launched on 22 April 2020 reported that there had been a decline of more than a third of threatened mammal numbers in the past 20 years, but the data also show that targeted conservation efforts are working.
[2] The team, led by John Woinarski of Charles Darwin University, looked at all species listed as threatened under the act in 2000 and 2022.
There was one fish (Murray cod) and one reptile (Flinders Ranges worm-lizard) on the list, along with fifteen mammals, eight birds, and four frogs.
Threatened species in Australia are protected by, or affected by, four main types of legislation: One fish is listed as extinct in the wild.