Lyla Lindsey
Australia is home to a diverse range of animals, many of which are unique to the country. This diversity is due to the continent's long geological isolation, with Australia separating from other landmasses around 30 million years ago. This isolation, combined with changes in climate and land formation, has resulted in a wide variety of flora and fauna found nowhere else in the world. Of the estimated 200,000 animal species in Australia, about 96% are invertebrates, and a large proportion of its plants, mammals, reptiles, and frogs are endemic.
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What You'll Learn
The Platypus: a semi-aquatic, duck-billed, egg-laying mammal
The platypus is a semi-aquatic, egg-laying mammal native to eastern Australia, including Tasmania. It is one of the five living species of monotremes, which are mammals that lay eggs. The other monotremes are the four species of echidnas. Platypuses are venomous and have a duck-like bill, a beaver-like tail, and otter-like feet. They grow up to 60 cm (2 ft) in length and have a brown, furry body with webbed feet. Platypuses are shy and quickly hide underwater when approached. If they are attacked, they inject venom through spurs on their hind legs.
The platypus is a unique creature that has puzzled naturalists for centuries. When it was first presented to English naturalists, they thought it was a hoax. Its scientific name, Ornithorhynchus anatinus, means 'duck-like bird-snout', reflecting its distinctive features. The platypus has a reptilian gait, with legs on the sides of its body rather than underneath. It also has extra bones in its shoulder girdle, including an interclavicle not found in other mammals.
As an egg-laying mammal, the platypus has a unique reproductive system. The female platypus lays her eggs in an underground burrow near the water's edge. The eggs develop in utero for about 28 days, with only about 10 days of external incubation. After hatching, baby platypuses nurse for up to four months before they can swim and forage on their own.
The platypus's senses are also adapted to its semi-aquatic lifestyle. Its watertight nostrils allow it to stay submerged for up to two minutes while foraging for food. It also has electroreceptors in its bill that help it detect prey in cloudy water by sensing tiny electrical currents generated by muscular contractions.
The platypus is a fascinating example of Australia's diverse wildlife. It is a shy and reclusive creature, and its unique characteristics have intrigued scientists and naturalists for centuries.
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The Echidna: a spiky mammal that lays eggs and has no nipples
Australia is home to a wide variety of animals, and about 80% of its plants, mammals, reptiles, and frogs are unique to the country. One such unique species is the echidna, a spiky mammal that lays eggs and has no nipples.
The echidna is a monotreme, one of only five such mammals in the world. The other four monotremes are all species of echidna, plus the platypus. Monotremes are mammals that lay eggs, and the echidna is one of only two living mammals that do so, the other being the platypus. Echidnas first evolved between 20 and 50 million years ago, descending from a platypus-like monotreme ancestor.
Echidnas are medium-sized, solitary mammals covered with coarse hair and spines made of keratin. They are usually black or brown, although there have been reports of albino echidnas with pink eyes and white spines. They have small eyes, long noses, and elongated and slender snouts that function as both mouth and nose. The snout is very sensitive to touch and can detect vibrations and electric signals to find prey such as earthworms, termites, and ants. Echidnas have no teeth but have long, sticky tongues that they use to feed.
Female echidnas lay a single, soft-shelled, leathery egg about once a year, which is about the size of a grape or a dime. The egg is deposited directly into a pouch on the female's belly, where it hatches after 10 days of gestation. The baby echidna, called a "puggle", is born larval and fetus-like, and sucks milk from the pores of two milk patches in the mother's pouch. Unlike other mammals, monotremes like echidnas do not have nipples or teats. After about 53 days, the mother moves the puggle to a burrow, where she returns to feed it every 5 to 10 days until it is big enough to survive on its own at around 7 months old.
Echidnas are found throughout Australia, Tasmania, and New Guinea, in habitats ranging from highlands to deserts to forests. They are usually between 12 and 17 inches long and weigh between 4 and 10 pounds, although some can weigh up to 6 kilograms. They are important for the environment, as a single echidna can move seven tons of soil each year.
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The Quoll: a nocturnal carnivorous marsupial
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 mostly ground-dwelling, but they can also climb trees. Quolls are mostly solitary, limiting social contact with other quolls to mating and other social activities.
There are six species of quoll, four of which are found in Australia: the eastern quoll, the northern quoll, the western quoll, and the tiger quoll (also known as the spotted quoll or spotted-tail quoll). The remaining two species reside in New Guinea: the bronze quoll and the New Guinean quoll. The eastern quoll became extinct on the Australian mainland in the 1960s, but it still exists in Tasmania. The tiger quoll is the largest of the species, growing up to 125 cm (including its long tail) and weighing up to 5 kg. The northern quoll is the smallest, with males weighing around 1 kg and females weighing significantly less.
Quolls have black to fawn fur with white spots, pink noses, long snouts, big ears, sharp teeth, and long bodies. Their genus name, Dasyurus, means "hairy-tail". Quolls can be differentiated by their tails, with the tiger quoll being the only species with a true pouch. The other five species have folds in the skin that face toward the tail, which develop during the breeding season.
Quolls are generalist, opportunistic carnivores, meaning they eat a wide variety of food as long as it is meat. Smaller quolls tend to eat insects, reptiles, small birds, and mammals, while larger quolls like the tiger quoll eat medium-sized birds and mammals, such as possums and rabbits.
Quolls are fragile and at risk, with their numbers declining due to threats such as the toxic cane toad, predators like feral cats and foxes, urban development, poison baiting, and habitat loss. Conservation efforts, including captive breeding programs and reintroductions, are in place to protect these unique creatures.
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The Numbat: a small, endangered marsupial that eats termites
The numbat, also known as the banded anteater, is a small endangered marsupial native to Australia. It is the faunal emblem of Western Australia. The species was once widespread across southern Australia, but is now restricted to several small colonies in Western Australia. It is therefore considered an endangered species and is protected by conservation programs. Numbats were recently reintroduced to fenced reserves in South Australia and New South Wales.
Numbats are insectivores and subsist on a diet of termites. An adult numbat requires up to 20,000 termites each day. They have a long sticky tongue that helps them pick up termites from the ground and from small holes in logs. They dig small holes in the ground to uncover the passageways that termites travel in when they go to and from the nest. Numbats do not chew their food as they lack proper teeth. They have blunt "pegs" instead. They gain a considerable amount of water from their diet and do not need to drink water.
Numbats are the only marsupials fully active during the day. They are under threat from habitat loss and introduced predators like foxes and feral cats. They have striped fur that helps them camouflage against the woodland floor. They also have eyes on opposite sides of their heads, which allows them to have good vision of things coming towards them. They usually freeze or run under the cover of bushes, trees, and logs to hide from danger.
Numbats live in Eucalypt woodlands where old and fallen trees provide hollow logs for shelter, nest sites, and foraging opportunities. They forage in open areas near the cover of shrubs. The presence of Numbats is determined by the availability of termites. Therefore, they do not occur in areas that are too wet or too cold for termites to flourish.
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The Tasmanian Devil: a scavenger, now only found in Tasmania
The Tasmanian Devil, a carnivorous scavenger, is now only found in Tasmania. Once seen throughout mainland Australia, the Tasmanian Devil (Sarcophilus harrisii) is now confined to the island of Tasmania, off the southern coast of Australia. It is a nocturnal, black-coated animal, the size of a small dog, and is the largest surviving carnivorous marsupial in the world. It is characterised by its stocky and muscular build, pungent odour, extremely loud and disturbing screech, keen sense of smell, and ferocity when feeding. The Tasmanian Devil plays a crucial role in Tasmania's ecosystem by performing natural pest control on introduced animals that threaten the island's native wildlife. It is the only native animal to successfully outwit invasive species such as feral cats and red foxes.
The devil's disappearance from the Australian mainland is a mystery, but its decline seems to coincide with an abrupt change in climate and the expansion of indigenous Australians and dingoes. The Tasmanian Devil became extinct on the mainland around 3,500 years ago, and fossil evidence suggests that they coexisted with dingoes for around 3,000 years. The cause of their extinction may have been direct hunting by humans, competition with dingoes, or a combination of both. The devil, as a scavenger with a short lifespan, may also have been highly sensitive to the intensification of the El Niño–Southern Oscillation (ENSO) during the Holocene.
In Tasmania, the devil is an important part of the ecosystem, and its presence helps control the population of invasive species. Unfortunately, the devil is now listed as endangered, with a decline of more than 60% in the last 10 years. The primary threat to the species is Devil Facial Tumour Disease (DFTD), a fatal and highly infectious cancer transmitted through biting. This disease has caused the Tasmanian Devil population to drop more rapidly than any other endangered species in Australia. Other threats to the species include road accidents and habitat destruction.
The Tasmanian Devil is an iconic symbol of Tasmania, and efforts are being made to conserve the species. The Australian government has implemented the Save the Tasmanian Devil Program, sending devils to zoos around the world to breed and manage the population. The devil is also protected under Tasmania's Threatened Species Protection Act 1995 and the Commonwealth's Environment Protection and Biodiversity Conservation Act 1999.
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Frequently asked questions
The numbat is an endangered small marsupial that survives in southwest Western Australia. The mountain pygmy possum is another small animal that is native to Australia. It is about the size of a mouse and is native to Australia.
The platypus is a venomous, egg-laying, duck-billed amphibious mammal that is native to Australia. The echidna is another unique animal found in Australia, with porcupine-like spines, a bird-like beak, and a quoll-like pouch.
The kangaroo is a large animal that is native to Australia. The koala is another large animal that is found in Australia, and it is known for its cuddly appearance and love for eucalyptus leaves.
