Lexi Webster
Australia is home to a vast array of unique wildlife, with an estimated 200,000 animal species, of which about 96% are invertebrates. The country's long geographic isolation, tectonic stability, and unique climate patterns have contributed to its high level of endemism, meaning that many of its animal species are found nowhere else on Earth. This diverse fauna includes mammals such as kangaroos, koalas, and the iconic platypus, as well as numerous venomous species such as snakes, spiders, and the deadly box jellyfish. The impact of human settlement, particularly European colonisation, has significantly altered Australia's ecosystems, leading to the extinction of numerous native species and ongoing threats to many more. Conservation efforts are now in place to protect this rich and unique biodiversity.
| Characteristics | Values |
|---|---|
| Total number of animal species in Australia | 200,000 (estimated) |
| Number of endemic animal species in Australia | 46% of birds, 69% of mammals, 94% of amphibians, 93% of reptiles, 40% of chordate species |
| Number of invertebrates in Australia | 96% of all animal species |
| Number of insects in Australia | 75% of all animal species (62,000 species estimated) |
| Number of insect orders | Coleoptera (28,200 species), Lepidoptera (20,816 species), Hymenoptera (14,800 species), Diptera (7,786 species), Hemiptera (5,650 species), Orthoptera (2,827 species) |
| Number of native placental mammals in Australia | Rats, mice, bats, and the dingo |
| Number of venomous animal species in Australia | Spiders, scorpions, octopus, jellyfish, molluscs, stonefish, stingrays, snakes, crocodiles |
| Number of shark species in Australia | 170 (70 endemic) |
| Number of snake species in Australia | 140 land snakes, 32 sea snakes (20 of which are the most venomous in the world) |
| Number of mammal species in Australia | 400 |
| Number of marsupial species in Australia | 140 |
| Number of bird species in Australia | Half of all bird species in Australia are endemic |
| Number of plant species in Australia | 24,716 |
| Number of kangaroos in Australia | 50 million |
| Number of koalas in Australia | N/A |
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What You'll Learn
Australia has around 400 mammal species
Australia is home to a diverse range of animals, with an estimated 200,000 animal species in total. Of these, around 400 are mammal species, including 2 monotremes, 154-175 marsupials, 83 bats, 69 rodents, 10 pinnipeds, 2 terrestrial carnivorans, 13 introduced ungulates, 2 introduced lagomorphs, 44 cetaceans, and 1 sirenian. This high level of endemism is due to the continent's long geographic isolation, tectonic stability, and unique patterns of climate change over geological time.
The Australian mammal fauna is unique, with a relative scarcity of native placental mammals. Marsupials, such as macropods, possums, and dasyuromorphs, occupy many of the ecological niches that placental animals occupy elsewhere. Australia has two of the five known extant species of monotremes and numerous venomous species, including the platypus, spiders, scorpions, octopus, jellyfish, molluscs, stonefish, and stingrays.
The settlement of Australia by Indigenous Australians and Europeans has significantly impacted the country's fauna. Hunting, the introduction of non-native species, and land-management practices have led to numerous extinctions. It is estimated that about 33-50 mammal species have become extinct since European settlement, with the Bramble Cay melomys believed to be the first mammal extinct due to human-induced climate change.
Conservation efforts are crucial to protecting Australia's unique mammal species. The federal Environment Protection and Biodiversity Conservation Act 1999 was created to meet Australia's obligations under the 1992 Convention on Biological Diversity, protecting native fauna and threatened species. The Australian Wildlife Conservancy also works to protect endangered species across 4.8 million hectares of land in regions like Kimberley, Cape York, Lake Eyre, and the Top End.
While Australia's mammal diversity is remarkable, it is important to note that many mammal species remain undiscovered and threatened by human activities. Scientists are on a mission to identify and conserve these species before they disappear, highlighting the urgency of ongoing conservation efforts in Australia.
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There are 55 different species of kangaroos
Australia is home to a diverse range of animal species, with an estimated 200,000 species in total, including around 40% endemic chordate species. Among these are the iconic kangaroos, which have become strongly associated with the country. In fact, there are 55 different species of kangaroos and their close relatives, known as macropods. These macropods belong to the family Macropodidae and include the well-known kangaroo species such as the red kangaroo, eastern grey kangaroo, and western grey kangaroo.
The red kangaroo, or Macropus rufus, is the largest surviving marsupial in the world and can be found in the arid and semi-arid regions of Australia. It is a symbol of Australia, appearing on the country's coat of arms and currency. The eastern grey kangaroo, on the other hand, is less famous internationally but is the most commonly sighted in Australia due to its range covering the fertile eastern regions. This species is also known as Macropus giganteus.
The western grey kangaroo, scientifically named Macropus fuliginosus, has a wide distribution across Western Australia and Victoria, favoring denser vegetation. Another species, the antilopine kangaroo (Macropus antilopinus), is found in the monsoonal tropical woodlands of northern Australia and is named for its fur, which resembles that of antelopes. These four species are the most commonly referred to as kangaroos, but there are numerous other macropods closely related to them.
In addition to these larger kangaroos, there are also tree-kangaroos, which inhabit the upper branches of trees in tropical regions. Furthermore, wallabies, which are considered the smaller members of the Macropodidae family, are widespread across mainland Australia, Tasmania, and Papua New Guinea. While kangaroos are protected native species, their populations sometimes require management to maintain the balance between their welfare and the protection of people, property, and biodiversity.
The kangaroo is deeply ingrained in Australian culture and is of great significance to the Aboriginal people. It is a symbol of national progress, always moving forward, and its image is used by many well-known Australian organizations. The kangaroo is also important ecologically, playing a role in promoting the regeneration of native plants. While some smaller macropod species are rare and endangered, kangaroos are relatively plentiful, and their management is a subject of ongoing discussion.
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20 of the 25 most venomous snakes in the world are native to Australia
Australia is home to a diverse range of animals, with an estimated 200,000 species, including 96% invertebrates. It is known for its venomous snakes, with 20 of the 25 most venomous snakes in the world calling Australia home.
The country's snake species have highly toxic venom, and while bites are rare, they can be deadly. The inland taipan, for example, has the most potent venom of any land snake in the world and can kill an adult human within 45 minutes. Other dangerous snakes in Australia include the eastern tiger snake, whose venom can cause poisoning in just 15 minutes, and the red-bellied black snake, which can cause blood-clotting disorders and nerve damage.
Eastern brown snakes are also a concern, as they are often found in suburban areas and are responsible for many bites when people try to kill them. Common death adders are another cause for caution, as they can strike up to two-thirds of their body length and inject a large amount of venom.
The good news is that snake bites in Australia are rare, and fatalities are low, thanks to the development of anti-venom. The country's unique ecology, with its long geographic isolation and tectonic stability, has contributed to the evolution of these venomous snakes, and they play an essential role in the natural balance of the ecosystem.
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Australia has about 140 species of land snakes and 32 species of sea snakes
Australia is known for its snakes, with approximately 140 species of land snakes and 32 species of sea snakes. This contributes to the country's diverse wildlife and fauna, which includes an estimated 200,000 animal species, of which about 96% are invertebrates. The largest group of invertebrates is made up of insects, comprising 75% of Australia's known species.
The country's geographic isolation, tectonic stability, and unique climate patterns have contributed to the high level of endemism, with 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles being endemic to the continent. Australia's fauna also includes unique animals like the koala, lyrebird, gray kangaroo, mountain pygmy possum, and alpine grasshopper.
The snakes in Australia are an iconic part of its fauna. While most people associate Australia with dangerous snakes, it's important to note that not all of these species pose a significant threat to humans. Out of the 100 venomous snake species, only about 12 are considered to be potentially fatal to humans.
Among the venomous land snakes in Australia, some of the most notable species include the Eastern brown snake, found in the eastern part of the country and known for its aggression and highly venomous bite. The Western brown snake, or Gwardar, is another species found across mainland Australia, avoiding the wetter regions. The Inland taipan, with the most potent venom of any land snake globally, prefers the rocky plains of Queensland, South Australia, New South Wales, and the Northern Territory.
Sea snakes, on the other hand, can be found in Queensland and the Northern Territory, often gathering near Swain Reefs and Keppel islands. These snakes are all venomous, but they are less likely to be aggressive and rarely bite. The file snake and the amethystine python, which can grow up to 5-6 meters in length, are among the sea snakes found in northern tropical Queensland.
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There are 170 species of sharks in Australia's waters
Australia is home to a wide variety of animals, with an estimated 200,000 animal species in total. Of these, about 96% are invertebrates, including insects, molluscs, arachnids, myriapods, and sponges. The country also has a high level of endemism, with 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles found only on the continent.
One notable aspect of Australia's fauna is the relative scarcity of native placental mammals, which has led to the proliferation of marsupials such as macropods, possums, and dasyuromorphs. Australia is also known for its venomous species, including spiders, scorpions, octopus, jellyfish, molluscs, stonefish, stingrays, snakes, and the iconic platypus.
Now, let's focus on the sharks in Australian waters.
Shark Species in Australian Waters
Australia's waters are home to approximately 170 shark species, ranging from the massive whale shark to the diminutive pygmy shark. The Coral Sea, off the coast of Queensland, is a particularly diverse area, with over 50 shark species calling it home.
Some of the more notable shark species found in Australian waters include:
- The Tiger Shark (Galeocerdo cuvier): A fearsome predator that roams both reefs and deep oceans in northern Australia. It scavenges a variety of prey, including whales, seals, stingrays, and jellyfish.
- The Bull Shark (Carcharhinus leucas): While not the largest shark, the bull shark makes up for it with its strong snout, powerful jaws, and aggressive demeanor. It will eat just about anything, including other sharks, and can even tolerate freshwater, allowing it to swim up rivers.
- The Thresher Shark (Alopias vulpinus): With a long skinny tail, the thresher shark can breach the water like a dolphin but poses no threat to humans in the tropical waters of the Kimberley, Top End, and Queensland.
- The Port Jackson Shark: This species lays spiral-shaped eggs, from which young sharks hatch.
- The Great Hammerhead (Sphyrna mokarran): Found in northern Australian waters from Sydney to the Houtman Abrolhos, this species is considered dangerous due to its appetite for rays, fish, crustaceans, and even other sharks.
- The Grey Nurse Shark (Carcharias taurus): Found in all Australian waters except Tasmania, the grey nurse shark has a fearsome appearance with exposed, razor-sharp teeth. However, it is not considered dangerous and feeds on fish, rays, squid, and crustaceans.
Sharks have played a crucial role in maintaining the health of the marine environment for over 400 million years. Unfortunately, their populations have declined due to human activities, with over 200 shark species listed as threatened and 50 as vulnerable by the IUCN. Conservation efforts are in place to protect these ancient predators, including through sustainable fishing practices and international plans of action for their conservation and management.
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Frequently asked questions
It is estimated that there are 147,579 accepted described species in Australia, with the total number of species estimated to be 566,398. This includes 8,128 chordate species, 98,703 invertebrates, 24,716 plants, 11,846 fungi, and 4,186 species in other groups.
Australia has a high level of endemism, with around 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles endemic to the continent. It is estimated that just over 40% of Australian chordate species are endemic, and 90% of insects and molluscs.
Australia has a unique fauna due to its long geographic isolation, tectonic stability, and unique climate patterns. It has a relative scarcity of native placental mammals, so marsupials occupy many ecological niches. Australia is also home to two of the five known extant species of monotremes, which are mammals that lay eggs, including the platypus.
Some common animal species in Australia include kangaroos, with around 50 million individuals and 55 different species in the country. Other common species include koalas, lyrebirds, emus, kookaburras, crocodiles, snakes, and various fish species such as barramundi, swordfish, and marlin.
Yes, Australia has many endangered species, and it is estimated that 380 animal species are classified as either endangered or threatened. The Australian Wildlife Conservancy works to protect endangered species across 4.8 million hectares of land. Some endangered species include the mountain pygmy possum, the grey kangaroo, and the Australian platypus.
