Lexi Webster
Australia is home to some of the world's most unique and fascinating species. From the cute and cuddly koala to the Tasmanian devil, the country's wildlife is found nowhere else in the world. The continent's long geographic isolation, tectonic stability, and unique climate change patterns have resulted in a high level of endemism, with many animals evolving separately from the rest of the world. Australia's fauna includes a large variety of animals, with endemic species comprising 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles. The country also has numerous venomous species, such as the platypus, spiders, scorpions, octopus, jellyfish, molluscs, stonefish, and stingrays. Humans have accelerated the rate of extinction for many Australian species, with hundreds lost since European settlement in 1788. Conservation efforts are now in place to protect Australia's vulnerable and endangered native animals and their habitats. So, which native Australian animal are you most like?
| Characteristics | Values |
|---|---|
| Unique species | Koala, Platypus, Kangaroo, Wombat, Dingo, Wallaby, Echidna, Kookaburra, Emu, Tasmanian Devil, Cassowary, etc. |
| Number of mammal species | Almost 400 |
| Number of marsupial species | 140 |
| Number of bird species | 46% of all birds |
| Number of parrot species | 56 |
| Number of venomous snake species | More venomous than non-venomous |
| Number of endangered species | 300+ |
| Number of extinct species | 33 mammals, 24 birds, 1 reptile, 4 frogs |
| Reason for extinctions | Hunting, introduction of non-native species, land-management practices, invasive species, habitat destruction |
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What You'll Learn
What is a monotreme?
A monotreme is a member of the egg-laying mammalian order Monotremata. Monotremes are considered ancient, with fossil evidence suggesting they were present during the Late Cretaceous and Paleocene epochs in southern South America. All extant species of monotremes are indigenous to Australia and New Guinea. They include the amphibious platypus and the terrestrial echidnas, which are found in continental Australia, Tasmania, and New Guinea. Monotremes are unique among mammals in that they lay eggs and have no teats, instead secreting milk through pores on their bellies to feed their young. They also possess a single bone in their lower jaw and have three middle ear bones.
The platypus is the only Australian mammal known to be venomous. Males have a venomous spur above the heel of each hind leg, which may be used to assert dominance during the breeding season. Platypuses also have a leathery beak that helps them sift through small invertebrates in riverbeds. Echidnas, on the other hand, have tongues covered in sticky mucus, enabling them to feed on ants and termites. The short-beaked echidna, Tachyglossus aculeatus, is the only species of echidna native to Australia, while three species of long-beaked echidnas are found in New Guinea.
Monotremes have a unique jaw structure and possess extra bones in their shoulder girdles, including an interclavicle and coracoid, which are not found in other mammals. They retain a reptile-like gait, with legs on the sides of their bodies rather than underneath. Additionally, monotremes have a single cloaca, an opening for bodily functions, which is reflected in their name, derived from the Greek words "monos" (single) and "trema" (hole).
The sequencing of the platypus genome has provided insights into monotreme evolution, revealing traits such as venom and electroreception. Monotremes also possess five pairs of sex chromosomes, with genetic similarities to birds, providing insights into the evolution of sex chromosomes in mammals. The presence of vitellogenin genes, necessary for egg yolk formation, suggests that the common ancestor of monotremes, marsupials, and placentals was oviparous.
Monotremes have primitive skeletal features and share some characteristics with extinct early mammal groups. Their relationships to other mammalian groups have been challenging to determine due to a combination of primitive and specialized traits, known as mosaic evolution. Some researchers consider monotremes to be members of Australosphenida, a clade containing extinct mammals from the Jurassic and Cretaceous periods in various regions, but this categorization is disputed.
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Why are so many Australian animals endangered?
Australia is home to a plethora of unique wildlife species, many of which are not found anywhere else in the world. However, a significant number of these native Australian animals are endangered. This can be attributed to various factors, including habitat destruction, invasive predators, inappropriate fires, and the impacts of a changing climate.
Habitat destruction is one of the primary threats to Australian wildlife. Land clearing, deforestation, and urbanisation have led to the fragmentation and loss of vital habitats for many species. For example, the koala, a marsupial found across eastern and southeastern Australia, has experienced a decline in its population due to the excessive clearing of eucalyptus tree forests, which provide both homes and food. Similarly, the black-flanked rock-wallaby, once widespread across central Australia, has been impacted by habitat destruction and is now listed as Endangered under national law.
Invasive predators have also played a significant role in endangering native Australian animals. The introduction of foxes and cats has led to the rapid decline of small marsupials such as the woylie, also known as the brush-tailed bettong. Numbats, a small to medium-sized marsupial native to Western Australia, are also hunted by feral cats, foxes, dingoes, and birds of prey due to their size.
Inappropriate fires and the impacts of climate change further exacerbate the problem. The inappropriate use of fire can destroy habitats and impact the survival of species, as seen in the case of the greater glider, a large gliding mammal found in eastern Australia. Climate change, including rising temperatures and extreme weather events, can make species more vulnerable, especially those that depend on cooler habitats. The mountain pygmy-possum, for instance, is only found in alpine and sub-alpine regions and is susceptible to burns on its paws during heatwaves.
The combination of these factors has led to a decline in Australia's rich biological diversity. Since European colonisation and settlement, more than 100 species have gone extinct, and over 570 native animal species are currently at risk of being lost forever. This includes iconic species such as the koala, which was listed as endangered by the Australian government in 2022, and the swift parrot, with fewer than 2,000 individuals left in the wild.
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What is a marsupial?
Marsupials are a diverse group of mammals belonging to the infraclass Metatheria, also known as Marsupialia. They are native to Australasia, Wallacea, and the Americas. There are more than 250 species of marsupials, with around 70% of them (over 330 species) concentrated on the Australian continent, including mainland Australia, Tasmania, New Guinea, and neighbouring islands.
Marsupials are characterised by their unique reproductive strategy. They give birth to underdeveloped young that continue to develop while attached to the nipples on the mother's lower belly. This feature of premature birth is accompanied by a pouch, or marsupium, which provides shelter, warmth, and nourishment to the developing offspring. While not all marsupial species have pouches, they are present in most, and the young must climb into them on their own after birth. The pouch opening is typically at the front for locomotive species like kangaroos, and at the back for those that walk or climb on all fours.
Marsupials exhibit distinct cranial features compared to placentals. Their skulls are relatively small and compact, with frontal holes known as foramen lacrimale at the front of the orbit. They have enlarged cheekbones that extend further to the rear, and their lower jaw's angular extension is bent toward the centre. Marsupials also have more openings in their hard palate than placentals. In terms of dentition, most Australian marsupials have a varying number of incisors between their upper and lower jaws, with many having between 40 and 50 teeth total.
Marsupials have typical mammalian characteristics, such as mammary glands, three middle ear bones, true hair, and bone structure. However, they differ from eutherians in several ways, including anatomical features and brain structure. Marsupials lack a corpus callosum, the part of the brain that connects the two hemispheres, resulting in a relatively smaller brain size compared to placental mammals. This difference in brain structure is believed to contribute to their limited vocal ability and generally less intelligent behaviour.
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What is a quoll?
Quolls are carnivorous marsupials native to Australia and New Guinea. They are primarily nocturnal, spending most of the day in a den and hunting at night. They are also solitary, with males and females only coming together for mating. Quolls are highly elusive and not easily seen or trapped in traditional wildlife traps.
There are six species of quoll, four of which are found in Australia and two in New Guinea. The four Australian species are the Western Quoll, the Eastern Quoll, the Spotted-tailed Quoll, and the Northern Quoll. The Eastern Quoll has been extinct on the mainland since the 1960s and is now only present in Tasmania. The Western Quoll, once found across 70% of Australia, is now mostly confined to the far south-west of Western Australia. The Spotted-tailed Quoll is the largest species, with males weighing about 7 kg (15 lb) and females 4 kg (8.8 lb). The Northern Quoll is the smallest, with males weighing around 1 kg and females being appreciably smaller.
Quolls have black to fawn fur, white spots, long tails, sharp teeth, and bright pink noses. Females have between five and eight teats and develop a pouch during the breeding season, which opens toward the tail. Their natural lifespans are 1 to 5 years, with larger species tending to live longer.
Quolls are generalist, opportunistic carnivores, meaning they eat a wide variety of food as long as it is meat. The Spotted-tailed Quoll can eat medium-sized birds and mammals, such as possums and rabbits. Smaller quoll species eat insects, reptiles, frogs, birds' eggs, small birds, and mammals. Quolls are also known to scavenge for food around campsites, rubbish bins, and roadsides, which increases their risk of being hit by cars.
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What is a wombat?
Wombats are short-legged, muscular quadrupeds that are native to Australia. They are marsupials, which means that female wombats carry their young in pouches on their undersides. The pouch of a wombat is distinctive in that it faces backwards, preventing soil from entering it when the wombat is digging. Wombats are herbivores, and their diets consist mostly of grasses, sedges, herbs, bark, and roots. They have rodent-like front teeth and powerful claws, which they use to dig extensive burrow systems. Wombats are among the largest burrowing mammals in the world and can run at speeds of up to 40 kilometres per hour.
Wombats are found in forested, mountainous, and heathland areas of southern and eastern Australia, including Tasmania. They have a variety of habitats, including mountains, forests, and grasslands. Wombats are typically about 1 metre (40 inches) in length and weigh between 20 and 35 kilograms. However, some prehistoric wombat genera were much larger, with the largest known wombat, Phascolonus, estimated to have weighed up to 360 kilograms.
Wombats are nocturnal and have poor eyesight, relying on their sense of smell to navigate and find food. They are known for their distinctive cubic faeces, which they use to mark their territories. Wombats have a very long digestive tract, with the digestive process taking between 14 and 18 days to complete. This slow metabolism helps them survive in arid conditions. Wombats typically live up to 15 years in the wild but can live longer than 30 years in captivity.
There are three known species of wombats: the common wombat (also known as the bare-nosed wombat), the Southern hairy-nosed wombat, and the Northern hairy-nosed wombat. The Northern Hairy-nosed Wombat is considered one of the rarest mammals in the world, while the Southern Hairy-nosed Wombat is listed as Near Threatened. Wombats are unique to Australia, and their name comes from the now-nearly-extinct Dharug language spoken by the Aboriginal Dharug people who originally inhabited the Sydney area.
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Frequently asked questions
The male platypus has a venomous spur on its hind leg that administers a painful sting.
The bilby can obtain enough water from its diet of seeds, fruits, and small insects, which is necessary as water sources are rare in the Outback.
The cassowary is one of the heaviest and most dangerous birds in the world, with a vivid blue neck and a helmet-like casque on its head.
The Australasian shoveler (Spatula rhynchotis rhynchotis) is a duck species that can be found in the swamp areas of southern Australia.
