Damon Mcknight
Australia is home to a wide variety of unique animals, including some of the world's most venomous snakes, spiders, and marine life. The country also has a history of megafauna, which are large animals such as the elephant, mammoth, rhinoceros, and Australia's own diprotodon. These megafauna became extinct during the Pleistocene Epoch, with some evidence suggesting that early humans contributed to their extinction through hunting and environmental changes. Today, Australia is known for its diverse range of endemic species, including monotremes like the platypus and echidna, as well as marsupials such as koalas and possums. The country also has its fair share of dangerous creatures, from the Sydney funnel-web spider to the box jellyfish and crocodiles.
| Characteristics | Values |
|---|---|
| Term for large animals in Australia | Megafauna |
| Examples of extinct megafauna | Mammoth, rhinoceros, Varanus priscus, Kadimakara, Zygomaturus, giant kangaroos, 1,000-pound kangaroos, 2-ton wombats, 25-foot-long lizards, 400-pound flightless birds, 300-pound marsupial lions, Volkswagen-sized tortoises, Meiolania |
| Examples of current megafauna | Saltwater crocodiles, box jellyfish, coastal taipan, tiger snakes, humpback whales |
| Reasons for extinction | Hunting by early humans, climate change, overhunting, environmental pressures |
| Time of extinction | 45,000 years ago |
| Co-existence with humans | Megafauna co-existed with humans for at least 30,000 years |
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What You'll Learn
Australia's megafauna
The role of human activity and climatic factors in the extinction of Australia's megafauna is a subject of debate among researchers. Some attribute the extinction to early Aboriginal Australians' hunting practices and their use of fire to manage their environment. Others highlight the increased aridity during peak glaciation, about 18,000 years ago, as a contributing factor. Recent evidence based on dating megafaunal remains suggests that humans were the primary cause of the extinction, with all forms of Australian megafauna becoming extinct approximately 46,000 years ago when the earliest humans arrived.
However, this conclusion has been disputed, as some megafaunal species may have overlapped with human presence, and the impact of fire on the landscape is questioned. The extinction of megafauna in Tasmania about 41,000 years ago, for example, is attributed to hunting rather than environmental modification through fire. Additionally, the interpretation of fossils and Aboriginal traditions suggests that megafauna may have coexisted with humans, and that the extinction was a gradual process influenced by various anthropogenic and environmental factors.
The Australian Museum and Melbourne Museum showcase megafauna skeletons and exhibits, providing insights into these prehistoric creatures. The study of fossils and archaeological artefacts contributes to our understanding of Australia's megafauna and the factors leading to their extinction, offering a glimpse into the unique biodiversity that once thrived in Australia.
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Human colonisation and hunting
Australia's megafauna included large animals such as the elephant, mammoth, rhinoceros, and the diprotodon, a large marsupial. Most of these species became extinct during the Pleistocene Epoch, and the roles of human colonisation and hunting in their extinction are contested.
Some researchers argue that the arrival of early Aboriginal Australians and their hunting practices may have contributed to the extinction of megafauna. However, others note that there is insufficient data to determine the exact time of extinction for many species. It is also important to consider that Aboriginal peoples have been in Australia for over 60,000 years and are known to have harvested game in a sustainable manner, co-existing with megafauna for at least 30,000 years.
Following the arrival of European settlers, the exploitation of fur seals and sea lions in the 18th, 19th, and 20th centuries has been documented. The introduction of species such as feral cats and European red foxes, as well as changed fire regimes, have been identified as primary contributors to the loss of Australian land mammals.
The British colonisation of Australia was facilitated by the introduction of cattle, and efforts to recapture and contain runaway herds prepared the ground for the construction of Sydney. This process involved the expropriation of Aboriginal land and the disruption of fragile ecosystems.
Human population growth and urbanisation continue to impact natural ecosystems and native fauna in Australia. Conservation efforts face challenges due to the complex interplay of factors influencing wildlife population decline. Human-induced habitat alteration, road trauma, and predation by domestic and feral cats are among the threats facing Australian wildlife today.
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Climate change
Australia is known for its unique wildlife, but climate change poses a significant threat to many of these species. The country has one of the highest rates of species extinction globally, and climate change is a major contributor to this. According to research published in PLOS ONE, nearly half of Australia's 200 species are threatened by climate change. This includes well-known Australian animals, such as the Green and Golden Bell Frog, the Carnaby's black cockatoo, and the iconic koala.
Amphibians, such as frogs, are highly vulnerable to climate change due to their small and fragmented distributions and reliance on specific moisture regimes and aquatic habitats. Climate change-induced droughts and rising temperatures impact their habitats, and in the case of the Green and Golden Bell Frog, the loss of suitable habitats can lead to population decline and potential extinction. Birds, on the other hand, are better able to adapt due to their ability to disperse over large areas.
Australia's marine life is also under threat. The Great Barrier Reef, a World Heritage Site, is suffering irreversible damage due to rising sea temperatures and ocean acidification. This impacts the countless marine animals that depend on the reef, and if left unchecked, the reef could shrink to less than 10% of its original size by 2050, resulting in a catastrophic loss of habitat. Additionally, green turtles in the northern Great Barrier Reef are in grave danger, as warming has resulted in 99% female hatchlings, threatening the population with complete 'feminisation'.
To protect Australian wildlife from the impacts of climate change, a range of strategies are necessary. This includes managing fire patterns in specific regions, habitat restoration, and creating corridors to counter habitat fragmentation. Additionally, addressing the root cause of climate change is crucial. Australia's high greenhouse gas emissions contribute to severe changes in the climate system, and transitioning to clean and affordable renewable energy sources is essential to slow down environmental deterioration. Reducing greenhouse gas emissions and adopting plant-based diets can help combat climate change and protect Australia's unique wildlife.
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Aboriginal Dreamtime stories
Australia is known for its unique megafauna, which includes large animals such as elephants, mammoths, rhinoceroses, and Australia's own diprotodon. The megafauna are believed to have co-existed with humans for at least 30,000 years, and their extinction is a topic of debate among researchers.
Monsters and large animals in Dreamtime stories have been associated with extinct megafauna. For example, colonists wrote about Aboriginal people identifying Diprotodon bones as belonging to bunyips, and Thomas Worsnop concluded that the fear of bunyip attacks at watering holes was a memory of when Diprotodon lived in marshes. John Walter Gregory outlined the Kadimakara story of the Diyari, which describes the deserts of Central Australia as once being fertile, well-watered plains with strange monsters called Kadimakara that lived in the vegetation and sometimes came to the ground to eat.
Aunty Beryl Carmichael, a custodian of many Ngiyaampaa stories, shares a creation story about two warriors from the Ngiyaampaa people of western New South Wales, called Eaglehawk and Crow. This story is about greed between two brothers-in-law and the creation of the Emu and the Jabiru. Another story from the GWINI people of the Broome area in Western Australia is about Min-Na-Wee and why the crocodile rolls. This story teaches youngsters about the effects of their behaviour on others.
Dreamtime stories are told to educate Aboriginal children and to teach important lessons about respect, kindness, and conduct. They are the basis for Aboriginal art, literature, community, and beliefs, and each story is unique, relating to different aspects of Aboriginal life.
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Modern-day giant animals
Australia is known for its dangerous wildlife, including 20 of the world's 25 most venomous snakes, man-eating sharks, gigantic saltwater crocodiles, and spiders. However, compared to prehistoric times, modern dangers seem tame.
The term "megafauna" refers to the giant animals that lived in Australia during the Pleistocene Epoch. Most of these species became extinct during the latter half of the Pleistocene, as part of a broader global extinction event.
Some of the megafauna species that once inhabited Australia include:
- The giant wombat-shaped Diprotodon, which may have survived in New South Wales until about 7,000 years ago.
- Varanus priscus, a giant lizard that died out nearly 46,000 years ago.
- Meiolania, a genus of huge terrestrial stem-turtles that measured up to 2.5 meters in length, with horned heads and spiked tails.
- Thylacoleo carnifex, the largest known carnivorous mammal to have lived in prehistoric Australia, comparable in size to female lions and tigers.
- Phascolarctos stirtoni, a giant koala that was one-third larger than its modern counterpart.
- Simosthenurus occidentalis, a species of leaf-eating kangaroo that was about as tall as a modern eastern grey kangaroo but much more robust.
The role of human and climatic factors in the extinction of megafauna is still debated. Some researchers believe that the arrival of early Aboriginal Australians, their hunting practices, and their use of fire to manage their environment may have contributed to the extinction. Others suggest that increased aridity during peak glaciation may have played a role, but most megafauna were already extinct by this time.
While Australia's modern-day animals may not be as giant as their prehistoric counterparts, they still pose significant dangers and challenges for humans and other creatures alike.
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Frequently asked questions
Australia has been home to many huge animals, known as megafauna, including the diprotodon, a giant wombat, giant kangaroos, and giant lizards. Many of these megafauna species became extinct between 45,000 and 46,000 years ago, with some evidence suggesting that human hunting and environmental changes contributed to their extinction.
Varanus priscus and Genyornis are examples of giant lizard species that were native to Australia. Varanus priscus is believed to have gone extinct around 46,000 years ago, while Genyornis may have survived until 40,000 years ago.
Yes, Australia is also home to the Australian box jellyfish, which can swim and has long tentacles that can inject poison. Another example is the Meiolania, a genus of huge terrestrial stem-turtle that measured up to 2.5 meters in length and had horned heads and spiked tails.
Yes, Australia had giant birds such as the Genyornis, which weighed around 400 pounds. Other large birds included the giant eagles, which may have gone extinct around 40,000 years ago.
Yes, Australia is known for its large modern-day animals, including the saltwater crocodile, which can grow up to 6 meters in length and weigh up to one tonne. Another large animal in Australia is the cassowary, which is considered the most dangerous bird in the world due to its powerful kick.
