Damon Mcknight
Rats are considered the second most successful mammal on the planet, after humans. They are known to spread infection and disease, and are responsible for the Black Death that ravaged Europe in the 1300s. Rats have successfully populated every continent except Antarctica. Australia is currently experiencing a boom in rodent numbers, with some parts of the country facing a rat infestation. There are nine distinct species of Australian native rats, seven of which are considered native. The most common rat in Australia is the black or brown rat, which was introduced in the late 18th century when Europeans began settling in the country.
| Characteristics | Values |
|---|---|
| Number of native rodent species in Australia | More than 60 |
| Number of introduced pest species in Australia | 3 |
| Total number of rat species in the world | More than 2,200 |
| Percentage of mammal species belonging to the Rodentia order | More than 40% |
| Most common rat species in Australia | Black or brown rat |
| Number of distinct native rat species in Australia | 9 |
| Number of distinct native rat species in Australia according to another source | 7 |
| Number of litters per year for Norway rats | 5-6 |
| Average number of pups per litter for Norway rats | 8-10 |
| Number of litters per year for roof rats | 4-5 |
| Average number of pups per litter for roof rats | 6-8 |
| Average lifespan of Norway and roof rats | 9-12 months |
| Average time to reach sexual maturity for Norway and roof rats | 3-4 months |
| Gestation period for Norway and roof rats | 21 days |
| Length of bush rats | 16 cm |
| Weight of bush rats | 65-225 g |
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What You'll Learn
Black and brown rats are not native to Australia
The black and brown rat—the most common rat in Australia—is not native to the country. These rats first arrived in Australia in the late 18th century when they travelled on ships with European settlers. They then spread rapidly throughout the nation.
Black and brown rats are bold and can be seen running along fences, climbing trees and drain pipes, and scurrying down public pathways. They are closely associated with humans and are common in urban areas. They are also highly adaptable and will eat almost anything. They are nocturnal but are often seen during the day. They are also prolific breeders, with females giving birth to five to ten young per litter, up to six times a year.
By contrast, native Australian rats are shy and rarely found in areas dominated by humans. They prefer to nest in dense forest understoreys, sheltering in short burrows under logs or rocks, and lining their nests with grass. One example of a native rat is the Bush Rat, which is found in woodland areas across Australia, particularly in the coastal regions of the south and east. It is a small omnivorous rodent, measuring 16 cm in length and weighing between 65 g to 225 g. It has soft grey-brown fur and pink-grey feet, with a tail that is brown to black and slightly shorter than its body.
The black and brown rat is an invasive species that spreads quickly and is known to spread a variety of diseases. They also transmit diseases through their urine and faeces. They pose a risk of bites and scratches.
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There are 9 distinct species of native Australian rats
Rats are often referred to as "the second most successful mammal on the planet" after humans. They are highly adaptable and have a reputation for being invasive and spreading infections and diseases. The Black Death, which ravaged Europe in the 1300s, is believed to have been spread by black rats, taking the lives of millions.
While the black and brown rat are the most common rat species in Australia, they are not native to the country. These rats were introduced in the late 18th century by European settlers. In contrast, native Australian rats are generally shy and skittish, rarely venturing into human-dominated areas. It is believed that there are nine distinct species of native Australian rats, seven of which are considered true natives.
The "Old endemics" group, members of the tribe Hydromyini, reached Australasia between 11 and 9 million years ago from Asia. The "New endemics", members of the tribe Rattini, arrived more recently, between 4 and 3 million years ago, also from Asia. These early arrivals included at least four or five different species of rat. One such species is the Rakali, or Water Rat, which is easily identifiable by its large size, golden fur, and long, white-tipped tail.
Native Australian rats have a diverse range of physical characteristics. For example, the Bush Rat is a small omnivorous rodent found in woodland areas across Australia, particularly in the coastal regions of the south and east. It has soft grey-brown fur and pinkish-grey feet, with a tail that is the same length or slightly shorter than its body. The Australian Swamp Rat is another native species, distinguished by its relatively short tail compared to its body length.
It is important to differentiate between native Australian rats and invasive species, as the latter pose significant health risks to humans. While native rats are generally shy and reclusive, invasive species like the black and brown rat are bold and can be seen in close proximity to humans, increasing the risk of disease transmission.
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Rats are the second most successful mammals on Earth
Rats are considered the second most successful mammals on Earth, behind humans. This success is measured by factors such as geographic range, population size, adaptability, evolutionary longevity, and impact on the planet. Rats have a vast global presence, with their story spanning thousands of years and nearly every continent. They are highly adaptable, able to survive in a wide range of habitats, including cities, where they take advantage of human activity and resources.
Rats are known for their rapid reproduction and ability to spread quickly. In Australia, for example, the black and brown rat species were introduced in the late 18th century by European settlers. These rats thrived in their new environment and spread throughout the nation. Australia has experienced periodic surges in its rat population, with certain conditions, such as wet weather and bountiful harvests, favouring their breeding.
The success of rats can also be attributed to their social behaviour. Rats are highly social and spend a lot of time with other rats, forming what resemble villages of related rats. They build complex burrow systems, adding more tunnels over time and connecting with neighbouring burrows, creating a vast network. This behaviour provides them with protection and enhances their survival.
Additionally, rats are known for their ability to spread disease and infection. The Black Death, which ravaged Europe in the 1300s, is a notable example of the impact rats can have on human populations. Their ability to transmit diseases and their invasive nature contribute to their success as a species.
While rats are considered the second most successful mammals, it is important to acknowledge that success is a multifaceted concept. When considering factors beyond geographic range and population size, such as species variety, insects or beetles may be considered more successful in their diversity. Nonetheless, the dominance of rats as a highly successful mammalian species is undeniable.
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Rats spread infection and disease
Rats are commonly referred to as "the second most successful mammal on the planet" after humans. This is due to their ability to spread rapidly and invade new territories, as well as their capacity to transmit various infections and diseases. While the exact number of rats in Australia is unknown, there are believed to be nine distinct species of native rats, seven of which are considered endemic. The most common rat species in Australia is the black or brown rat, which was introduced by European settlers in the late 18th century. These rats are bold and can be seen in urban areas, making them a significant concern for public health.
Rats are known to carry and transmit several diseases that can be harmful to humans and animals. The transmission of diseases occurs through various routes, including direct exposure to rat-infected feces, urine, bites, scratches, and indirect exposure through arthropod vectors such as fleas, ticks, or mites. One of the most well-known examples of a rat-spread disease is the Black Death, a plague that ravaged Europe in the 1300s and resulted in millions of deaths.
Leptospirosis is another disease commonly associated with rats. It is a bacterial infection that can be contracted through contact with contaminated water or exposure to rat urine or feces. Rat-bite fever is transmitted through bites or scratches, and Salmonellosis results from consuming food or water contaminated by rat feces. Plague, a disease carried by rats and transmitted by fleas, can cause serious illness and even death if left untreated.
In addition to these direct transmissions, rats can also spread diseases indirectly. Hantavirus Pulmonary Syndrome, for example, is a potentially life-threatening disease transmitted by the rice rat. It can be spread by inhaling dust contaminated with rat urine or droppings, direct contact with rat feces, or, less frequently, through a bite. Cutaneous Leishmaniasis is another example, transmitted to humans by the bite of an infected sand fly that has fed on a wild wood rat.
The presence of rats in Australia, particularly in urban areas, poses a significant risk of disease transmission. With the recent surge in rat populations due to favourable breeding conditions and bountiful harvests, the risk of rat-borne infections spreading is heightened. This is a concerning issue for public health authorities and residents alike, requiring proactive measures to control rat infestations and mitigate the potential spread of diseases.
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Rats are difficult to get rid of
Rats are considered the "second most successful mammal on the planet" after humans. They are invasive, fast-spreading, and known to spread infection and disease. The Black Death that ravaged Europe in the 1300s was spread by black rats, taking the lives of millions.
Rats can enter buildings in a variety of ways: by digging under shallow foundations, through open windows and doors, sidewalk grates, vents, floor drains, gaps under doors, letter drops, fan openings, and openings for pipes or wires. They can also arrive inside large packages of food or merchandise. To prevent rats from entering, it is important to rat-proof buildings by sealing potential entry points and removing outdoor shelter options like junk piles and old fences.
To get rid of rats, some sources recommend using traps baited with dried fruit, peanut butter mixed with oats, or cheese. Others suggest contacting pest control experts, who may use rat poison. However, this requires careful consideration to avoid harming children or pets. Overall, it is much easier to keep rats out than to eliminate them once they have infested an area.
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Frequently asked questions
It is difficult to say exactly how many rats there are in Australia, but it is believed that there are nine distinct species of Australian native rats, seven of which are considered true natives. The most common rat in Australia is the black or brown rat, which is an invasive species.
Native Australian rats are called Bush Rats, which are found in woodland areas across Australia, and Swamp Rats, which are native to Victoria.
The invasive rats are the black rat and the brown rat, which were introduced to Australia by European colonists in the late 1700s.
Native Australian rats are very shy and skittish, so they are rarely found in areas dominated by humans. Invasive rats, on the other hand, are bold and can be seen running along fences, climbing trees and drain pipes, and scurrying along public pathways at night.
Yes, rats are a significant problem in Australia. They are known to spread diseases and can cause damage to homes, businesses, farms, and food supplies. In 2021, parts of Queensland and New South Wales experienced a boom in rodent numbers, with mouse populations reaching plague conditions.
