Australia operates under the Environment Protection and Biodiversity Conservation Act 1999, which designates threatened species across six categories: extinct, extinct in the wild, critically endangered, endangered, vulnerable, and conservation dependent. As of 2024, the federal government lists approximately 1,900 animal and plant species as threatened. The Act covers species, ecological communities, and migratory species that move between Australia and other countries. Enforcement sits with the Department of Climate Change, Energy, the Environment and Water. States and territories maintain additional lists, creating layers of protection that sometimes differ from federal designations.
The koala holds federal listing as endangered in Queensland, New South Wales, and the Australian Capital Territory as of February 2022. Populations in South Australia and Victoria remain unlisted at federal level. Eucalyptus woodland loss drove the uplisting from vulnerable to endangered, with 2019-2020 bushfires eliminating habitat across three million hectares. Koalas require approximately 100 trees per individual in fragmented landscapes, but less in continuous forest. The federal government allocated 50 million dollars in 2022 for habitat restoration targeting koala corridors. Disease presents an additional constraint: chlamydia infection rates reach 80 percent in some Queensland populations, causing infertility and blindness.
The Tasmanian devil survives only in Tasmania following extinction on the Australian mainland approximately 3,000 years ago. Devil facial tumor disease emerged in 1996 in northeast Tasmania, spreading across 95 percent of the species' range within 20 years. The contagious cancer transmits through biting during feeding and mating. Wild populations declined 80 percent by 2015. The Save the Tasmanian Devil Program established insurance populations on Maria Island in 2012 and at multiple mainland zoos. Disease-free devils returned to wild sites in Tasmania beginning 2020. Genetic resistance appears in some populations, with immune response documented in northwestern Tasmania.
The southern corroboree frog measures 25 to 30 millimeters in length and displays black skin with yellow stripes. The species inhabits alpine sphagnum bogs above 1,300 meters in the Snowy Mountains of New South Wales. Wild population counts dropped from approximately 200 in 1996 to fewer than 30 mature individuals by 2010. Chytrid fungus Batrachochytrium dendrobatidis causes mortality in tadpoles and adults. Taronga Conservation Society Australia maintains captive breeding populations at four facilities. Annual releases into Kosciuszko National Park since 2010 total more than 3,000 individuals. Wild breeding remains sporadic, with egg masses counted each summer by New South Wales National Parks and Wildlife Service staff.
The woylie, also called the brush-tailed bettong, weighs between 1.0 and 1.6 kilograms. Historical range covered approximately 60 percent of Australia. By 1990 the species survived in three Western Australian locations and one South Australian island. Introduced predators, particularly the red fox, eliminate woylie populations within years of fox arrival. Western Shield program began in 1996, distributing sodium fluoroacetate baits across 3.5 million hectares in Western Australia. Woylie numbers increased from 2,000 in 1996 to 40,000 by 2006. A subsequent decline beginning 2006 reduced populations 90 percent by 2010, attributed to disease and cat predation. Translocations to fenced reserves at Mount Gibson and Matuwa commenced in 2015.
The orange-bellied parrot migrates between breeding sites in southwest Tasmania and wintering grounds in coastal Victoria and South Australia. The species nests in tree hollows within 10 kilometers of the Tasmanian coast. Wild population reached a minimum of 14 individuals in 2016. Captive breeding at Healesville Sanctuary, Moonlit Sanctuary, and Taroona produces approximately 20 juveniles annually for release. Competition for nest hollows from common starlings and tree martins limits breeding success. Artificial nest boxes installed in breeding areas show 60 percent occupancy. Winter habitat along the Victorian coast faces urban development pressure, with critical feeding sites mapped in coastal saltmarsh systems.
The northern hairy-nosed wombat exists at a single location: a 32-square-kilometer fenced area in Epping Forest National Park in central Queensland. Population grew from 35 individuals in 1982 to 315 in 2021. A second population was established at Richard Underwood Nature Refuge in 2009, reaching 60 individuals by 2022. The species excavates burrows in sandy soils and feeds on native grasses. Drought during 2015-2017 reduced juvenile survival to 30 percent. Supplementary feeding trials tested lucerne distribution but showed minimal uptake. Genetic diversity remains low across all individuals, with evidence of historic bottleneck approximately 12,000 years ago.
The regent honeyeater occupies box-ironbark forests in Victoria and New South Wales. Population declined from approximately 1,500 individuals in 1995 to between 350 and 400 in 2022. Loss of winter-flowering eucalyptus species reduced nectar availability across 90 percent of historical range. BirdLife Australia coordinates captive breeding at five facilities. Released birds receive radio transmitters and colored leg bands for post-release monitoring. Song degradation emerged as a concern in 2019: isolated males fail to learn normal vocalizations, reducing breeding success. Audio playback at release sites broadcasts normal song to educate juveniles.
Christmas Island hosts several endemic reptiles under federal protection. The blue-tailed skink declined following yellow crazy ant invasion in the 1990s. Ant supercolonies spray formic acid, killing small vertebrates. Aerial application of fipronil baits across 400 hectares annually suppresses ant densities. The Christmas Island gecko survives in areas treated for ants but disappeared from untreated forest. Captive insurance populations reside at Taronga Zoo and Melbourne Zoo. Christmas Island forest skinks showed similar declines, with the last confirmed wild observation in 2014. Taronga maintains the sole captive population, numbering approximately 500 individuals as of 2023.
The western swamp tortoise inhabits ephemeral swamps in the Swan Valley, north of Perth. Wild population occupies two nature reserves totaling 180 hectares. Adults burrow during summer months and emerge when swamps fill between June and November. Eggs incubate for 200 to 300 days, with hatchlings emerging in the second or third winter after laying. Perth Zoo began captive breeding in 1988, producing more than 900 hatchlings. Annual releases since 2008 add 20 to 40 juveniles to wild sites. Climate change shortened hydroperiod of breeding swamps: Twin Swamps held water for 150 days in 1990 but averaged 90 days between 2010 and 2020. Artificial irrigation trials extended water availability at Ellen Brook Nature Reserve.
The grey nurse shark inhabits rocky reefs along the Australian east coast. The eastern population between southeast Queensland and southern New South Wales numbers between 1,000 and 1,500 individuals. Critical habitat includes Fish Rock Cave near South West Rocks and Wolf Rock near Rainbow Beach. The species shows high site fidelity, with tagged individuals returning to the same aggregation sites across 15 years. Gestation lasts approximately 12 months, producing two pups per litter through intrauterine cannibalism. Females reproduce every two years. Fishing mortality, particularly through beach meshing programs and spear fishing before protection in 1984, caused the population decline. New South Wales banned spear fishing of grey nurse sharks in 1984. Queensland designated critical habitat zones with restricted fishing in 2002.
The Gouldian finch inhabits tropical savanna woodland across northern Australia. Wild population declined 80 percent between 1980 and 2000, attributed to changed fire regimes and cattle grazing. The species feeds on sorghum grass seeds, which require specific fire intervals to produce abundant seed crops. Late dry-season fires eliminate seed production across large areas. Savanna Burning programs in Arnhem Land manage fire timing, conducting early dry-season burns across approximately 28,000 square kilometers annually. The finch shows three color morphs: black-headed, red-headed, and yellow-headed. Red-headed individuals carry genetic variants affecting immune function. Captive breeding programs exist primarily outside Australia, with European and North American facilities holding thousands of individuals.
The mountain pygmy-possum weighs 30 to 60 grams and inhabits boulder fields above 1,400 meters in the Snowy Mountains and Victorian Alps. Total wild population numbers between 2,000 and 3,000 individuals across four isolated sites. The species enters torpor for approximately seven months, from April to November, relying on fat reserves accumulated through consumption of Bogong moths. Bogong moth migrations declined 90 percent between 2017 and 2022, attributed to drought and agricultural intensification in breeding areas across inland New South Wales and Queensland. Supplementary feeding trials at Mount Buller provided sunflower seeds and almonds during pre-hibernation periods. Ski resort development fragments habitat, with the species documented crossing beneath snow grooming runs through constructed tunnels.
The night parrot remained unconfirmed between 1912 and 1990, with single specimens collected in 1990 and 2006. Sustained observations began in 2013 near Boulia in western Queensland. The species inhabits spinifex grasslands with approximately 15 years post-fire age. Camera trap networks and acoustic recording detected night parrots at five locations across Queensland and Western Australia by 2022. Pullen Pullen Reserve in Queensland protects 56,000 hectares of confirmed habitat. Feral cats kill night parrots, with cat-killed specimens recovered in 2015 and 2020. Predator-proof fencing protects 120 hectares at Pullen Pullen. Fire management maintains a mosaic of spinifex ages, with maximum intervals of 20 years.
The Leadbeater's possum occupies montane ash forests in the Central Highlands of Victoria. The species requires hollow-bearing trees exceeding 120 years in age. Logging of old-growth forest reduced habitat by 90 percent between 1900 and 2000. The 2009 Black Saturday bushfires burned 45 percent of remaining habitat. Wild population declined from approximately 7,500 individuals in 1980 to between 1,500 and 2,000 in 2020. Healesville Sanctuary maintains captive breeding populations. Nest boxes installed across 2,500 locations show 30 percent occupancy. Victorian government announced protection of all remaining old-growth ash forest in 2019. Regrowth forests require 150 years to develop suitable hollows, creating a habitat gap until mid-2100s.
The great white shark receives federal protection along the entire Australian coastline. Populations in southern Australia intermix with those in New Zealand. Juvenile sharks aggregate in coastal nursery areas including Port Stephens in New South Wales and Spencer Gulf in South Australia. Adults migrate along the continental shelf, with satellite tagging documenting movements exceeding 5,000 kilometers. The species takes 15 to 20 years to reach maturity. Females give birth to between four and 14 pups following 12 to 18 months gestation. Beach protection programs in New South Wales and Queensland use drumlines and mesh nets, which incidentally catch white sharks. New South Wales deployed SMART drumlines in 2020, which alert rangers to captures and allow release of non-target species. Acoustic monitoring arrays track tagged sharks along the east coast.
The Plains-wanderer inhabits native grasslands in northwestern Victoria, southern New South Wales, and eastern South Australia. The species walks rather than flies, feeding on seeds and invertebrates. Females display brighter plumage than males and initiate courtship. Males incubate eggs and raise chicks alone. Conversion of native grassland to wheat cultivation eliminated 99 percent of habitat by 1980. Wild population estimated at fewer than 1,000 individuals in 2022. Melbourne Zoo established captive breeding in 2005, producing 200 chicks by 2020. Conservation grazing programs on private land maintain short grassland structure, with 40 landholders participating in Victoria and New South Wales. Spring burning degrades habitat, killing ground-nesting birds. Grazing by livestock at specific densities creates optimal structure.
The western ground parrot survives in coastal heathland between Fitzgerald River and Cape Arid in Western Australia. The species differs genetically from the eastern ground parrot in Tasmania and eastern Australia. Population declines followed increased fire frequency, with optimal habitat requiring 15 to 30 years post-fire. Cats and foxes predate nests and adults. The 2015 Noonaera fire burned 60 percent of known habitat. Post-fire surveys documented 90 percent population decline. Remaining population estimated at fewer than 150 individuals. Perth Zoo breeds western ground parrots from wild-collected eggs, producing 20 to 30 chicks annually. Translocations to islands without introduced predators commenced planning in 2022. Acoustic monitoring deploys recorders across 400 square kilometers to detect calling birds.
The Australian sea lion breeds at 80 colonies across South Australia and Western Australia. Global population numbers approximately 14,000 individuals. The species shows an 18-month breeding cycle, unique among pinnipeds. Females exhibit strong site fidelity, returning to natal colonies to breed. Males compete for territories at haul-out sites during breeding seasons. Bycatch in demersal gillnet fisheries kills approximately 130 sea lions annually. Shark bycatch reduction devices, mandatory in South Australian waters since 2018, reduced sea lion captures by 70 percent. The Seal Bay Conservation Park on Kangaroo Island hosts approximately 1,000 individuals across a 3-kilometer beach. Visitor infrastructure restricts human access to designated viewing areas.
The golden-shouldered parrot nests in terrestrial termite mounds in Cape York Peninsula, Queensland. The species excavates nest chambers 30 to 50 centimeters into mound structures. Breeding occurs between April and June. Changed fire regimes collapsed termite mound integrity, with hot late-season fires destroying nest sites. Early dry-season burning maintains savanna structure and termite mound stability. The species disappeared from approximately 50 percent of historical range between 1970 and 2000. Conservation programs in Staaten River National Park conduct prescribed burns across 40,000 hectares annually. Artificial nest chambers constructed from concrete show 40 percent occupancy. Illegal capture for aviary trade continues, with two prosecutions in Queensland between 2015 and 2020.
The bridled nailtail wallaby inhabited inland Queensland and New South Wales until presumed extinct in 1937. A population rediscovered in 1973 near Dingo, Queensland, numbered approximately 300 individuals. Taunton National Park, established in 1979, protects the core population. Translocations to Idalia National Park in 1996 and Avocet Nature Refuge in 2001 established additional populations. Predator-proof fencing encloses 2,500 hectares at Taunton. Total population reached approximately 3,000 individuals by 2020. The species shows cyclic population dynamics, with declines following drought years. Supplementary water points provide drought refugia. Queensland Parks and Wildlife Service conducts spotlight counts across 30 kilometers of transects quarterly.
The Mary River turtle inhabits the Mary River system in southeast Queensland. Males develop algae on their heads and bodies, earning the nickname "punk turtle." The species breathes through cloacal respiration, remaining submerged for extended periods. Females nest on sandy banks between October and December. Eggs incubate for 60 to 80 days. Historical collection for the pet trade removed thousands of eggs and juveniles between 1960 and 1990. The species received federal protection in 1994. Nest protection cages exclude goannas and foxes from nesting banks. Tiaro Coal Project, proposed in 2010, threatened water quality in critical habitat. Environmental impact assessment documented presence of 4,000 individuals across 50 kilometers of river. The project was rejected in 2019. Urban development increases sedimentation, degrading benthic habitat.
The northern quoll occurs across northern Australia from Pilbara region in Western Australia to southeast Queensland. Populations declined 90 percent following cane toad arrival in occupied range. Toads reached Kakadu National Park in 2001, eliminating quolls from lowland areas within four years. The species consumes frogs and invertebrates, attacking toads and dying from bufotoxin poisoning. Taste aversion training uses small toads to condition quolls to avoid larger toxic individuals. Trained quolls released at Kakadu showed 60 percent survival compared to 20 percent for untrained controls. Translocations to toad-free islands include Astell Island and Indian Island in the Northern Territory. Genetic rescue programs crossbred surviving populations with individuals from Western Australia to restore genetic diversity. Males die after single breeding season, aged one year.
The swift parrot migrates between breeding sites in Tasmania and wintering habitat in Victoria and New South Wales. The species nests in tree hollows in old-growth eucalyptus forest. Breeding occurs between September and December. Pairs raise three to four chicks per nest. Sugar gliders, introduced to Tasmania, predate nesting females and chicks. Glider-occupied areas show 75 percent nest failure compared to 20 percent in glider-free zones. Population declined from approximately 8,000 individuals in 1990 to fewer than 2,000 in 2022. Breeding habitat concentrated in southeast Tasmania, with major sites including Bruny Island and the Huon Valley. Winter habitat includes box-ironbark forests in Victoria.