Lyla Lindsey
Australia is home to a diverse range of marsupials, with around 200 to 250 species found on the continent. Among these, the largest marsupial is the red kangaroo (Macropus rufus), which can grow up to 2 metres (6.6 feet) tall and weigh up to 90 kg (200 pounds). Males are typically larger than females, and the species is characterised by its soft, pale grey coat. Red kangaroos are social animals, often living in groups of three or more, and they are native to eastern Australia, ranging from Queensland to Victoria.
| Characteristics | Values |
|---|---|
| Name | Red Kangaroo |
| Scientific Name | Macropus rufus |
| Habitat | Grasslands to forests throughout much of eastern Australia |
| Diet | Herbivorous |
| Height | 2 metres (6.6 feet) |
| Length | 3 metres (10 feet) |
| Weight | 90 kg (200 pounds) |
| Group Name | Mob |
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What You'll Learn
The red kangaroo is Australia's largest marsupial
Marsupials are any of the more than 250 species belonging to the infraclass Metatheria, sometimes called Marsupialia. They are characterised by premature birth and the continued development of the newborn while attached to the nipples on the mother's lower belly, or within a pouch on their abdomen. This provides shelter, warmth, and nourishment to the developing young.
Marsupials are native to Australasia, Wallacea, and the Americas. They first arose in South America and migrated to Australia via the Antarctic Land Bridge around 50 million years ago. At that time, Antarctica was not covered in ice but was instead a temperate rainforest.
Today, there are about 250 marsupial species in Australia, with around 120 in South America and just one in North America. The red kangaroo is a member of the kangaroo family, Macropodidae, which also includes the quokka, a cat-sized marsupial found on several islands off the west coast of Australia.
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Marsupials are immigrants to Australia
Marsupials are not native to Australia, despite the country being famous for its kangaroos, koalas, and wombats. In fact, around 70% of the world's 334 extant marsupial species are found on the Australian continent, including mainland Australia, Tasmania, New Guinea, and nearby islands.
Marsupials are believed to have reached Australia via the Antarctic Land Bridge during the Early Eocene, around 50 million years ago. At that time, Antarctica was not covered in ice but was instead a temperate rainforest. It appears that marsupials and their relatives migrated from South America, across Antarctica, and eventually made their way to Australia. This theory is supported by the discovery of similar fossil marsupials in both Australia and South America, as well as DNA evidence.
The oldest fossil marsupials from Australia were found at a 55-million-year-old site called Tingamarra, in Queensland. Some of these fossils, such as the insect-eating Djarthia, may be the ancestors of all living Australian marsupials. After this, there is a significant gap in the Australian fossil record, with the next oldest marsupial fossils being 25 million years old. This suggests that there was a rapid diversification of marsupials within Australia.
There are several theories as to why marsupials thrived in Australia. One idea suggests that when resources were scarce, marsupial mothers could abandon developing young in their pouches, while placental mammals had to continue spending resources on their unborn young. Another theory posits that the absence of placental mammals in Australia allowed marsupials to dominate the ecosystem. However, this idea has been challenged by the discovery of a 55-million-year-old fossil tooth, which belonged to a placental mammal or a relative, indicating that placental mammals were present in Australia alongside marsupials.
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Marsupials are born underdeveloped and continue to develop in their mother's pouch
The largest marsupial found in Australia is the red kangaroo (Macropus rufus). Males can grow to about 2 metres (6.6 feet) in height, 3 metres (10 feet) from muzzle to tail tip, and weigh up to 90 kg (about 200 pounds).
Marsupials are a diverse group of mammals that are native to Australasia, Wallacea, and the Americas. They are characterised by their unique reproductive strategy, where the young are born in a relatively undeveloped state and then nurtured within a pouch on their mother's abdomen. This pouch provides the developing young with shelter, warmth, and nourishment.
Marsupials are born after a very short gestation period, typically between 12 and 33 days, but some species have gestation periods as low as 10 days. When born, they are in an extremely altricial state, equivalent to an 8–12-week-old human fetus or a 10–12-day-old mouse fetus. They are born blind, furless, and small, weighing anywhere from 4 to 5 grams in the smallest species to over 800 grams in the largest, like the red kangaroo.
At birth, marsupials must travel unaided to the teat or pouch area, which requires a variety of neuromuscular and sensory capacities. They must then attach themselves to the teat and begin to feed and process nutrients. This early stage of development can be considered embryonic, as the young marsupials exhibit a mosaic of accelerated and delayed development of various tissues and organs, as well as several special adaptations to survive in their early state.
The young continue to develop in the mother's pouch for weeks or months, depending on the species. They remain attached to the teat and rely on the pouch to maintain a constant temperature of 30–32 °C (86–90 °F) until they are well-furred and able to regulate their body temperature. Once they have reached this stage of development, they leave the pouch and begin to care for themselves.
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Australia is home to around 200 species of marsupials
Marsupials are native to Australasia, Wallacea, and the Americas, with around 70 species found in the Americas, mainly in South and Central America. The largest living marsupial is the red kangaroo (Macropus rufus), which can grow to a height of 2 metres (6.6 feet) and a weight of up to 90 kg (200 pounds). The smallest marsupial is the long-tailed planigale (Planigale ingrami), measuring just 12 cm (4.7 inches) in total length.
The evolutionary split between placentals and marsupials occurred 125-160 million years ago in the Middle Jurassic-Early Cretaceous period. Marsupials first appeared in Australia around 50 million years ago, having travelled from South America via the Antarctic Land Bridge. The oldest fossil marsupials from Australia, similar to those found in South America, have been discovered at a 55-million-year-old site called Tingamarra in Queensland.
Today, Australia is home to a diverse range of marsupials, including kangaroos, koalas, wombats, wallabies, possums, and the Tasmanian devil. Marsupials can be burrowing, such as wombats; terrestrial, such as kangaroos; semiaquatic, such as the water opossum; or arboreal, such as the koala. They play an important role in the ecosystem and are a unique part of Australia's natural heritage.
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The Tasmanian devil is the largest carnivorous marsupial
The Tasmanian devil, or Sarcophilus harrisii, is the largest surviving carnivorous marsupial in the world. It is confined to the island of Tasmania, a part of Australia, where it is native. The Tasmanian devil is the size of a small dog, weighing between 4 and 14 kg and standing about 30 cm tall. It has a squat, thick build, with a large head and a tail that is about half its body length. Its forelegs are slightly longer than its hind legs, and it can run up to 13 km/h for short distances. The fur of the Tasmanian devil is usually black, often with irregular white patches on the chest and rump, though around 16% of wild devils do not have these white patches.
The Tasmanian devil has the most powerful bite relative to body size of any living mammalian carnivore. Its large head and neck allow it to generate one of the strongest bites per unit of body mass of any extant predatory land mammal. Its jaw can open wide, to 75–80 degrees, allowing it to tear meat and crush bones with a force that can even bite through thick metal wire. The teeth and jaws of Tasmanian devils resemble those of hyenas, an example of convergent evolution. Like all dasyurids, the devil has prominent canines and cheek teeth, with three pairs of lower incisors and four pairs of upper incisors.
Tasmanian devils are curious and energetic, travelling long distances each night in pursuit of food, sometimes covering up to 10 miles. They use their keen senses of smell and hearing to find prey or carrion. They are primarily scavengers, eating anything that comes their way, but they also hunt live prey such as small mammals and birds. Devils are usually solitary, but they sometimes eat and defecate together in a communal location. When a group of devils feeds together, harsh screeching and spine-chilling screams can be heard.
The Tasmanian devil population is rapidly declining and the species is currently listed as endangered. Threats to Tasmanian devils include attacks by domestic dogs and foxes, being hit by cars, loss of habitat, and disease. Devil facial tumour disease, a rare, contagious cancer found only in devils, has been killing adult devils in recent years, with tens of thousands of Tasmanian devils dying from the disease. Conservation efforts are helping to protect these iconic marsupials from extinction.
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Frequently asked questions
The largest marsupial found in Australia is the red kangaroo. Males can grow to about 2 metres (6.6 feet) in height, 3 metres (10 feet) from muzzle to tail tip, and weigh up to 90 kg (about 200 pounds).
Yes, Australia is home to a variety of large marsupials, including the eastern grey kangaroo, which is the second-largest living marsupial, the wallaby, wombat, koala, and the Tasmanian devil, which is the world's largest carnivorous marsupial.
Marsupials are natively found in Australasia, Wallacea, and the Americas. In Australasia, they are found in Australia, Tasmania, and New Guinea, as well as the surrounding islands. In the Americas, they are found in South and Central America, and a few species, like the Virginia opossum, are found in North America.
