Leslie Massey
Australia has one of the highest rates of endemicity of any country, with 87% of mammal species, 93% of reptiles, 94% of frogs, and 45% of bird species found nowhere else on Earth. This high level of endemism is due to the continent's long geographic isolation, tectonic stability, and unique climate change patterns over geological time. Australia's diverse habitats include rainforests in the mountains of New South Wales, the Gondwana Rainforest, Barrington Tops National Park, and the unique fauna of its 8000 islands. The country's mammal groups with the highest endemicity are monotremes and marsupials, including the Tasmanian devil, koala, wombat, and kangaroo.
| Characteristics | Values |
|---|---|
| Number of islands | Over 8000 |
| Number of bird species | 800 |
| Percentage of endemic bird species | 45% |
| Number of mammal species | 87% |
| Percentage of endemic mammal species | 80% |
| Number of reptile species | 93% |
| Number of frog species | 240 |
| Percentage of endemic frog species | 94% |
| Number of invertebrate species | 96% of all animal species |
| Number of insect species | 90% of all insects and molluscs |
| Number of venomous species | N/A |
| Examples of endemic species | Koala, Wombat, Platypus, Echidna, Tasmanian Devil, Quokka, Saltwater Crocodile, Common Brushtail Possum, Common Wombat, Bridled Nail-Tail Wallaby, Satin Bowerbird, Grey-Headed Flying Fox, Little Red Flying-Fox, Woylie or Brush-Tailed Bettong, Bennett's Tree-Kangaroo |
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What You'll Learn
Marsupials, including kangaroos, wallabies, wombats, koalas, and quolls
Marsupials are a group of mammals that raise their young in a pouch. Australia is home to a wide variety of marsupials, including kangaroos, wallabies, wombats, koalas, and quolls.
Kangaroos are perhaps the most iconic Australian marsupial. They belong to the family Macropodidae, which also includes wallabies and wallaroos. The largest kangaroos can reach heights of up to 2 meters and weigh up to 85 kg. The eastern grey kangaroo is a common Australian marsupial found in grasslands and forests throughout much of eastern Australia. Kangaroos are also known for their ability to hop around using their powerfully muscled tails.
Wallabies are smaller members of the Macropodidae family and are found in forests, shrublands, and grasslands in eastern mainland Australia and Tasmania. The red-necked wallaby, also known as Bennett's wallaby, has soft, grey fur with a reddish tinge across the back of its neck.
Wombats are another well-known Australian marsupial. The common wombat is the largest burrowing herbivorous mammal in the world and is native to Australia. They are known for their excellent burrowing skills and charming appearance. Wombats are found in Tasmania, East Gippsland, and the Southern Highlands, among other areas.
Koalas are distributed across South Australia, Victoria, New South Wales, and Queensland. They are known for their fluffy ears and spoon-shaped noses, and they primarily feed on eucalypt leaves. Koalas are very picky eaters, only consuming around 35 of Australia's 600 eucalypt species.
Quolls are carnivorous marsupials found in Tasmania and New Guinea, with four species native to Australia. The eastern quoll, for example, is a medium-sized dasyurid marsupial that preys on small animals such as mammals, reptiles, birds, and insects. They are nocturnal hunters and are known to approach feeding Tasmanian devils for scraps.
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Monotremes, including the platypus and echidna
Monotremes are a group of mammals distinguished from all other mammals by their egg-laying reproductive method. They are also characterised by their lack of teats and a single opening in their body used for reproduction and the excretion of solid and liquid waste. The platypus and the echidna are the only surviving monotremes, with three extinct monotremes known from the fossil record: Teinolophos and Steropodon from the Cretaceous, and Ornithorhynchus from the Pliocene. Platypuses and echidnas are native to Australia and New Guinea, and are the only mammals known to have a sense of electroreception, which they use to detect prey in cloudy water.
The platypus (Ornithorhynchus anatinus), sometimes called the duck-billed platypus, is a semi-aquatic, egg-laying mammal native to eastern Australia, including Tasmania. Its unusual appearance caused considerable confusion and doubt among European naturalists and scientists when it was first discovered, with many believing it was a fake. The platypus has a streamlined body and a broad, flat tail covered in dense waterproof fur, which provides excellent thermal insulation. It propels itself through the water using its short, webbed front limbs, while its partially webbed hind feet act as rudders. Its tail is used for storing fat reserves, and it has strong claws for burrowing and moving on land. The male platypus has a spur on the hind foot that delivers extremely painful venom, which may also be used to assert dominance over other males during the breeding season.
The four species of echidna are the platypus's closest living relatives. Three species of long-beaked echidna are found in Papua New Guinea, while the short-beaked echidna is found in both Australia and Papua New Guinea. Echidnas appear very different from platypuses, being stocky, rounded animals that feed on land. However, they share several key characteristics that distinguish them from all other mammals. Like the platypus, echidnas lack teeth and have an unfurred bill or beak that contains receptors capable of detecting electrical fields produced by their prey. Unlike the platypus, echidnas incubate their eggs in a pouch.
The evolutionary relationship between echidnas and platypuses is poorly understood, with the earliest known echidna fossils no more than 15 million years old. It is believed that echidnas likely developed from a platypus-like ancestor between 19 and 78 million years ago. Several fossil discoveries since the early 1970s have shed some light on the origins of monotremes, indicating their presence in Australia during the Mesozoic Era when Australia was part of the supercontinent Gondwana.
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Birds, including parrots, cockatoos, galahs, and kookaburras
Australia has a strong claim to be the world's greatest hotspot of bird endemism. The country is home to a wide variety of endemic bird species, including parrots, cockatoos, galahs, and kookaburras.
Parrots
Australia is home to 57 species of parrots, including the King parrot, which is the largest Australian true parrot. The King parrot is endemic to the coast and mountain ranges of eastern Australia, from Cooktown in Queensland to Port Campbell in Victoria. The Red-winged parrot is widespread in northern and eastern Australia, and can be found in open habitats like dry woodlands, grasslands, and scrubland. The Superb parrot is endemic to southeastern Australia, and can be found in the Riverina area of New South Wales and Victoria.
Cockatoos
Australia has 14 species of cockatoos, including the Galah, which is the most common and widespread. Galahs can be found throughout mainland Australia, except for the driest areas and the far north of Cape York Peninsula. They have also been introduced to Tasmania and New Zealand. Galahs are easily identifiable by their distinctive pink and grey plumage and acrobatic flight. They form huge, noisy flocks and feed on seeds, mostly from the ground. Another cockatoo species in Australia is the Gang-gang, which is endemic to the coastal regions of southeastern Australia. Male Gang-gangs have bright red heads and crests, while females have grey plumage.
Galahs
Galahs, also known as pink and grey cockatoos or rose-breasted cockatoos, are one of Australia's most abundant and widespread bird species. They are highly adaptable and can be found in a wide variety of habitats, including metropolitan areas such as Adelaide, Perth, and Melbourne. Galahs have a pale silver to grey back, a pink face and breast, and a light pink crest. They form permanent pair bonds and are known for their humorous antics, such as sliding down cables and wires.
Kookaburras
Kookaburras are native to the eastern mainland of Australia, as well as New Guinea and the Aru Islands. There are five species of kookaburras, including the laughing and blue-winged varieties. Kookaburras are known for their distinctive call, which resembles human laughter and has been widely used in films, television, and theme park attractions. They live in sclerophyll woodland and open forests, and their population is currently in decline due to predators, lack of prey, and environmental factors.
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Bats, including the grey-headed flying fox and little red flying fox
Australia is home to over 90 species of bats, including the grey-headed flying fox and the little red flying fox. These bats are endemic to the country and play an important ecological role in their respective habitats.
Grey-headed flying fox
The grey-headed flying fox (Pteropus poliocephalus) is a megabat native to Australia. It is the largest bat species in the country, with a wingspan of up to 1 metre and a weight of up to 1 kilogramme. The species is characterised by its dark grey body, light grey head, and reddish-brown collar. Its fur covers its entire body, extending down to its ankles, a feature that distinguishes it from other flying foxes. The grey-headed flying fox is endemic to the south-eastern forested areas of Australia, mainly east of the Great Dividing Range. Its range extends from Bundaberg in Queensland to Geelong in Victoria, with outlying colonies in Ingham, Finch Hatton, and Adelaide.
Grey-headed flying foxes are considered sequential specialists due to their diverse diets. They feed on pollen, nectar, and fruit from a wide range of plant species, including eucalypt and rainforest trees. They play a crucial role in dispersing the pollen and seeds of native Australian plants, especially in subtropical rainforests. This makes them ecologically significant.
Little red flying fox
The little red flying fox (Pteropus scapulatus) is a megachiropteran bat native to northern and eastern Australia. It is the smallest species of Pteropus in mainland Australia, weighing about half a kilogramme. The species is characterised by its reddish-brown pelage, with short fur covering most of its body and sparse fur on the lower part of its legs. The fur on its head ranges from dark to light grey shades.
The little red flying fox is found in coastal and inland areas, inhabiting tropical to temperate regions. They are known for their unusual method of obtaining drinking water during dry periods, skimming the surface of streams to gather water onto their fur while in flight. They are also important contributors to woodland ecology, acting as major pollinators of trees that provide nectar at night.
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Rodents, including rats and mice
Australia has a unique assemblage of mammal species, with rodents making up about a quarter of its mammal species. The first rodents are thought to have arrived in Australia between 5 and 10 million years ago, with some estimates placing this event as far back as 9-7 million years ago. These early rodents underwent a wide radiation, resulting in the species known as the "'old endemics'". Represented by 14 extant genera, these include the Pseudomys species, which are considered 'old endemics' and are part of the early radiation of rodents that colonized Australia from the late Miocene to the early Pliocene. Pseudomys vandycki, a small murid rodent from the Pliocene of central Queensland, is one of the earliest Australian rodents in this group.
The subfamily Murinae, which includes all endemic Australian rodents, is characterized by three cusp rows in each of the first and second lophs of M1 (the first upper molar) and molars with closed roots. These dental features lead to extensive molar wear and sometimes even the complete removal of the crown of the tooth. The differences in the morphology of the molar cusps are linked to the dietary habits of these rodents, which can vary from granivory to piscivory.
About a million years ago, rats entered Australia from New Guinea and gave rise to seven species of Rattus, collectively known as the "new endemics". This group of rodents arrived in Australia later, during the Pleistocene, and their arrival marked a significant shift in the country's rodent population.
Rodents in the family Muridae, which includes old world rats and mice, are the largest family of mammals, boasting over 1100 species in about 267 genera. They likely originated in Asia, and their presence in Australia can be attributed to the proximity of the two regions during the Pleistocene and Pliocene Epochs.
While the diversity of rodents in Australia is impressive, with new genera being discovered, the history of these creatures in the country is complex and still being unravelled. The study of fossil sites and molecular evidence provides valuable insights into the evolution and immigration patterns of these fascinating creatures.
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Frequently asked questions
Australia's long period of isolation from other continents, since its separation from Gondwana about 40 million years ago, is the main reason for its high level of endemism.
Some examples of endemic mammals in Australia include kangaroos, wallabies, wombats, koalas, platypuses, echidnas, and dingos.
Yes, Australia has a high diversity of endemic birds, including parrots, cockatoos, galahs, kookaburras, and the Southern Cassowary.
Yes, Australia has a high diversity of endemic reptiles, including venomous species such as snakes, scorpions, and stingrays.
Yes, Australia has a high diversity of endemic invertebrates, including insects and molluscs.
