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Australia is a country with a varied landscape, which has resulted in the world's most unique animal collection. The country is home to more species than any other developed country, with 87% of its mammal species, 93% of its reptiles, 94% of its frogs, and 45% of its bird species found nowhere else on Earth. Australia's long period of separation from the rest of the world has allowed its wildlife to evolve to suit the conditions of the continent. The country's varied landscapes include tropical rainforests and swamps in the northeast, endless deserts in the central regions, and forests and grasslands in the south. These landscapes are home to a diverse range of animal life, from charismatic kangaroos and koalas to enigmatic echidnas and platypuses.
| Characteristics | Values |
|---|---|
| Number of species | Between 200,000 and 300,000 |
| Number of described species | 100,000 |
| Native mammal species | 250 |
| Bird species | 550 |
| Reptile species | 680 |
| Frog species | 190 |
| Marine and freshwater fish species | 2,000 |
| Unique marsupials | Kangaroos, opossums, koalas, wombats, tree kangaroos, brush-tailed bettongs, burrowing bettongs, brush-tailed phascogales, band hare-wallabies, mountain pygmy possums |
| Monotremes (egg-laying mammals) | Platypus, echidna |
| Other mammals | Quokka, Tasmanian devil, dingo, rabbit |
| Reptiles | Saltwater crocodile (the largest living reptile in the world), snakes |
| Insects | Termites, butterflies |
| Amphibians | Bilingual frog, water-holding frog |
| Marine animals | Whales (humpback and southern right), Migaloo (a celebrity albino humpback whale) |
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What You'll Learn
- Marsupials: kangaroos, koalas, wombats, and opossums carry their young in pouches
- Monotremes: the platypus and echidna are egg-laying mammals
- Reptiles: Australia has 680 species of reptiles, including crocodiles and snakes
- Birds: 550 species of birds, including the palm cockatoo and bird-wing butterflies
- Aquatic life: humpback and southern right whales migrate along Australia's coasts
Marsupials: kangaroos, koalas, wombats, and opossums carry their young in pouches
Australia is home to a diverse range of marsupials, including kangaroos, koalas, wombats, and opossums, all of which carry their young in a pouch on their stomach. Marsupials are a unique group of mammals, and Australia's varied landscape provides the ideal environment for these creatures to thrive.
Kangaroos are an iconic symbol of Australia, and with good reason. There are about 50 different types of kangaroos, including two tree-dwelling species. Despite their large size, kangaroos are excellent swimmers. With a population of around 50 million kangaroos, there are almost twice as many kangaroos as there are humans in Australia. Grey kangaroos are particularly common and can be found in forests, shrublands, and heaths.
Koalas are another well-known marsupial native to Australia. These fluffy tree-dwellers are known for their love of eucalyptus leaves, which make up their entire diet. Koalas are typically quite lazy, sleeping between 18 and 22 hours a day. Unfortunately, koalas are facing the threat of extinction due to habitat loss.
Wombats are Australia's second-largest marsupial. Despite their rotund appearance, wombats can reach impressive speeds of up to 40 kilometres (25 miles) per hour. There are three species of wombats in Australia, with the bare-nosed wombat being the only species in the genus Vombatus.
Opossums, or possums, are also common marsupials in Australia. The mountain pygmy possum, for example, is a species found in the high mountains of the Temperate Zone.
Marsupials play a crucial role in Australia's unique ecosystem, and their ability to carry their young in pouches has ensured the survival and proliferation of these fascinating creatures in the diverse habitats found across the continent.
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Monotremes: the platypus and echidna are egg-laying mammals
Australia is home to a unique collection of animals, including monotremes, which are egg-laying mammals. Monotremes are the only living mammals that lay eggs, and they include the platypus and four species of echidnas or spiny anteaters. These mammals are considered "`primitive'" due to traits such as egg-laying, a cloaca, and incomplete homeothermy, which they share with reptiles. They also have a reptilian gait, with legs on the sides of their bodies rather than underneath.
The platypus is a semi-aquatic mammal found only in Australia, with the bill of a duck and a furry body. It spends most of its life in the water and has venomous spurs on its hind limbs. Platypuses are known for their well-developed electrosensory and mechanosensory systems, which they use for foraging in cloudy water. They also have colour vision, which they use for nesting and reproduction on land.
Echidnas, on the other hand, are terrestrial mammals. They have spurs on their hind limbs that are vestigial and non-functional. Echidnas have a well-developed olfactory sensory system and dichromatic vision, with different light absorption spectra than platypuses. While the exact evolutionary relationship between platypuses and echidnas is uncertain, molecular data suggest that they share a venomous common ancestor.
Monotremes are considered "living fossils" that provide insight into what our distant ancestors might have looked like. They have unique structural differences in their brains, jaws, digestive tracts, and reproductive tracts compared to other mammals. Despite laying eggs, female monotremes nurse their young with milk, just like other mammals. These egg-laying mammals have survived and evolved due to the benefits of egg-laying and their ability to adapt to their specific habitats.
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Reptiles: Australia has 680 species of reptiles, including crocodiles and snakes
Reptiles are ectothermic, meaning their body temperature varies with the outside temperature. They have scales and reproduce by either laying eggs or giving birth to live young. While many people fear reptiles, particularly snakes, they are typically shy creatures that will escape when confronted.
Australia is home to 680 species of reptiles, including crocodiles, lizards, turtles, and snakes. Crocodiles, members of the order Crocodilia, are large aquatic reptiles that spend most of their time in the water. They are fearsome predators with powerful jaws and a strong bite. The saltwater crocodile, also known as the "salty," is the largest crocodile in Australia and the world, reaching lengths of over 6 meters. It has a wide snout and body and is typically dark green or nearly black in colour. Saltwater crocodiles can be found in northern Australia in estuaries, river systems, and swamps, as well as in some Southeast Asian countries.
Lizards, members of the order Squamata, include species such as the common bluetongue, also known as the Australian blue-tongued skink. It is a large lizard with smooth scales, a stout body, short legs, and a bright blue tongue. The thorny devil, or thorny dragon, is another lizard species found throughout much of Australia, excluding the northernmost and eastern regions. It inhabits dry habitats and has adaptations to collect moisture from the air.
Australia is also home to a diverse range of snakes, with nearly 200 known species, only about 25 of which are considered potentially deadly. The inland taipan is the world's most venomous snake.
The varied landscape of Australia, including tropical rainforests, swamps, deserts, and grasslands, provides diverse habitats for these reptiles, contributing to the country's unique animal collection.
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Birds: 550 species of birds, including the palm cockatoo and bird-wing butterflies
Australia is home to a wide variety of birds, with 550 species of land and aquatic birds, 45% of which are found only in Australia. The country's varied landscapes, climates, topography, and soils have contributed to the diverse bird life found in different regions.
In the Tropical Zone, the mountainous northeast is home to gorgeous bird-wing butterflies (Ornithoptera). These butterflies favour the rainforests and thrive in this specific environment.
Australia is also home to the Palm Cockatoo, a distinctive large black cockatoo weighing up to 1 kilogram with a wingspan of about 1.1 meters. The Bar-tailed Godwit, a large wader growing between 37-39 centimeters and weighing up to 450 grams, is another unique bird species found in Australia.
The country's vast coastline and aquatic environments also support a variety of bird species. The Australian magpie (Gymnorhina tibicen) is one of the bird species found throughout the different ecological zones of Australia.
In addition to the diverse bird species, Australia is also known for its iconic animals such as kangaroos, koalas, wombats, and echidnas. The country's unique fauna has evolved over millions of years of separation from the rest of the world, making it a fascinating destination for wildlife enthusiasts.
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Aquatic life: humpback and southern right whales migrate along Australia's coasts
Australia's aquatic life is characterised by the migration of humpback and southern right whales along its coasts. Each year, humpback whales migrate along the Australian coastline, travelling up to 10,000 kilometres. They journey from their feeding grounds in the Southern Ocean to the warmer, sub-tropical waters of northern Australia, where they mate and give birth. This migration sees the whales travelling north along the east coast of Australia, with popular viewing locations including Byron Bay, Hervey Bay, and the Great Barrier Reef lagoon. The whales can be observed displaying acrobatic behaviour, with distinctive bushy blows and tail flukes, making them a popular attraction for whale watchers.
Humpback whales have a faster breeding cycle, which has contributed to their recovery from the impacts of historical whaling. Their population has increased significantly since commercial whaling ceased in the 1960s, with their conservation status improving from Critically Endangered to Least Concern. However, climate change poses a new threat to these baleen whales, as increasing ocean temperatures may affect their food sources of krill and copepods.
Southern right whales, along with blue whales, were once targeted by whalers when humpback whales became scarce. This led to a significant decline in their population. The Australian government has since taken steps to protect whale species, including establishing the Australian Whale Sanctuary under the Environment Protection and Biodiversity Conservation Act of 1999.
The migration of humpback whales along Australia's eastern coastline has been described as a spectacular event, attracting thousands of visitors to coastal towns. The whales' presence in the warm, protected waters of places like Hervey Bay offers a unique opportunity for marine biologists and eco-tour operators to observe their behaviour.
The southern right whale is also mentioned as part of Australia's aquatic life, with whale-watching tours offered in Flinders Bay and the Ningaloo Reef. The southern right whale is not mentioned as extensively as the humpback whale in the sources, but it is clear that both species are a significant part of Australia's aquatic life and attract much attention during their migrations along the country's coasts.
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Frequently asked questions
Australia has a varied landscape, leading to a unique collection of animals, many of which are endemic to the country. Some of these unique animals include koalas, kangaroos, wombats, quokkas, Tasmanian devils, saltwater crocodiles, and platypuses.
The koala is threatened with extinction as their natural habitat is being eradicated. The Bridled Nailtail Wallaby was believed to be extinct for much of the 20th century until a surviving population was discovered in 1973. The dingo, a wild dog, was the first animal imported to Australia, and it eats platypus eggs and bird eggs. Dingoes, along with rabbits, are an example of introduced species that can harm native wildlife.
Australia has many zoos and wildlife sanctuaries where you can see native animals. Wildlife sanctuaries are focused on rehabilitation and protecting threatened species, and many have wildlife hospitals. Australia's varied landscapes, including its grasslands, forests, and coastal areas, are also home to many native species.
