Lexi Webster
The koala is an iconic Australian animal, recognised worldwide as a symbol of Australia. Koalas are native to Australia and found nowhere else. They are marsupials, with a distinctive appearance, including a large head, fluffy ears, and a stocky, tailless body. Koalas live in eucalyptus forests in southeastern and eastern Australia, where they feed on eucalyptus leaves. Their diet is toxic to most animals, but koalas have a specialised digestive system that allows them to tolerate it. While koalas are beloved by many, their numbers are declining due to various threats, including habitat destruction, disease, and climate change.
| Characteristics | Values |
|---|---|
| Diet | Eucalyptus leaves, lophostemon, melaleuca, and corymbia species (such as brush box, paperbark, and bloodwood trees) |
| Water Intake | Mostly from leaves, but also from water sources during heatwaves and droughts |
| Sleeping Habits | Up to 18-20 hours every day to conserve energy due to low-energy diet |
| Habitat | Eucalyptus forests of southeastern and eastern Australia |
| Weight | 4-15 kg |
| Lifespan | 13-18 years in the wild |
| Predators | Dingoes, large owls, birds of prey such as Wedge-tailed Eagles |
| Threats | Deforestation, disease, habitat loss, climate change, bushfires, droughts, human activity |
| Conservation Status | Vulnerable, Endangered in Queensland, New South Wales, and the Australian Capital Territory |
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What You'll Learn
Koalas eat eucalyptus leaves
Koalas are one of Australia's most famous animals, and they rely on the eucalyptus tree for both habitat and food. Koalas eat mainly eucalyptus leaves, also known as gum leaves, and can eat up to a kilogram of leaves per day. Eucalyptus leaves are poisonous to most animals, but koalas have a special fibre-digesting organ called a caecum that helps to detoxify the chemicals in the leaves. The caecum contains millions of bacteria that break down the fibre, making it easier for the koala to absorb. In addition to providing nutrition, the leaves also provide water, so koalas rarely need to drink.
Koalas are very picky eaters and will only eat a few of the hundreds of species of eucalypts in Australia. They prefer leaves at the top of the tallest trees that contain more liquid and nutrients. The sharp front incisors of a koala allow them to nip leaves from the tree, while their molars or back teeth are shaped to cut and shear the leaves rather than crush them.
The high toxicity of eucalyptus leaves means that the koala's digestive system has to work hard to break down the toxins and extract limited nutrients. This is why koalas sleep so much—they get very little energy from their diet. In fact, koalas sleep or rest for up to 22 hours each day, which is believed to be an adaptation to their leaf-based diet.
Unfortunately, koala numbers are declining due to various threats, including deforestation, disease, habitat loss, and climate change. The increasing carbon dioxide in the atmosphere is decreasing the nutritional quality of eucalyptus leaves and causing longer and more intense droughts and wildfires. The 2019-2020 Australian bushfire season resulted in the loss of nearly three billion animals, including koalas.
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They rarely drink water
Koalas rarely drink water. The word "koala" is thought to originate from an Australian Aboriginal language, Dharug, which roughly translates to "no drink" or "no water". Koalas are folivore specialists, feeding mainly on eucalyptus leaves, and occasionally on the leaves of other plant species. Eucalyptus leaves are toxic, and even in small amounts, they can be fatal to most animals. Koalas' digestive systems are particularly good at tolerating this toxic diet. Special liver enzymes and symbiotic gut bacteria help break down the poisonous compounds, allowing koalas to survive on a diet of eucalyptus leaves.
Koalas can eat more than a pound of eucalyptus leaves a day. They get most of their water intake from these leaves, which are juicy and contain a lot of water. They are very picky eaters, choosing leaves at the tops of the tallest trees that contain more liquid and nutrients. Koalas are also known to lick water running down the smooth surface of tree trunks during rainfall, a phenomenon called "stemflow".
Koalas are native to Australia, where they can only be found in the southeast and eastern parts of the country, along the coastlines of Queensland, New South Wales, South Australia, and Victoria. They live in forests and open woodlands, typically dominated by eucalyptus tree species. In inland areas, koalas can be found living in eucalyptus woodlands close to water sources such as streams and creeks.
Koalas are highly territorial mammals, and they will generally tolerate other members of the same species during the breeding season. They rely heavily on their sense of smell to make better food choices and detect other koalas' scent markings on trees. They are also very selective feeders, using their prominent, leathery noses to differentiate toxin levels in eucalyptus leaves and choose the juiciest, most nutrient-rich ones.
Koalas are listed as vulnerable by the International Union for the Conservation of Nature. Their numbers have been declining due to various factors, including deforestation, disease, habitat loss, and climate change.
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They sleep a lot to conserve energy
Koalas are native to Australia and are recognised worldwide as symbols of the country. They are tree-climbing animals that live in the eucalyptus forests of southeastern and eastern Australia. Koalas are folivore specialists, feeding mainly on eucalyptus leaves, which are toxic to most animals. Eucalyptus leaves contain toxic compounds similar to cyanide, and even in small amounts, they can be fatal.
Despite their distinctive appearance, koalas were historically hunted by Indigenous Australians and depicted in myths and cave art for millennia. They were also hunted to meet the demand for skins in London. The Marsupial Destruction Act (1877) officially sanctioned and encouraged the industry.
Koalas have a very slow metabolism and can sleep for up to 18–20 hours a day. This is due to their low-energy diet, which requires a lot of energy to digest. The leaves they consume are very low in energy, comprising only about 5% sugars and starches on average. The koala's digestive system has to work hard to break down the toxins and extract the limited nutrients. As a result, they get very little energy from their diet, which is why they sleep so much to conserve energy.
The word "koala" is thought to originate from one of the Australian Aboriginal languages, Dharug, which roughly translates to "no drink" or "no water". This may explain why koalas rarely drink water, as most of their water intake comes from eating fresh eucalyptus leaves.
Unfortunately, koala numbers are on the decline, and they are now listed as an endangered species in Queensland, New South Wales, and the Australian Capital Territory. Their populations have been drastically reduced, and their habitats have been fragmented by the reduction of continuous habitat, deforestation, drought, disease, and climate change.
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They are vulnerable to climate change
Koalas are vulnerable to climate change due to a combination of factors, including their specialized habitat and dietary needs, as well as the direct impacts of rising temperatures and intensifying natural events.
Firstly, koalas are highly dependent on their specific habitat and diet. They are adapted to live only in certain woodland and forest ecosystems, particularly in southeastern and eastern Australia, where eucalyptus trees are abundant. Eucalyptus leaves are the primary food source for koalas, and they also derive much of their moisture from these leaves. However, climate change is reducing the nutritional quality of eucalyptus leaves. Increasing carbon dioxide levels in the atmosphere lower the protein content of the leaves and make them even less nutritious for koalas. This forces koalas to search for alternative food sources and water, putting them at greater risk of predation and road accidents.
Secondly, rising temperatures directly impact koalas' survival. Their thick fur and skin make it challenging for them to adapt to higher temperatures, making them susceptible to heat stress and dehydration. As temperatures increase, koalas may face fatal heat stress, especially in locations with reduced water availability.
Additionally, climate change intensifies natural events such as droughts and bushfires, further threatening koala populations. During droughts, koalas are forced to descend from their trees to find water, exposing them to predators and other dangers on the ground. More frequent and severe bushfires, such as those experienced in Australia during 2019-2020, result in the loss of vast areas of koala habitat and the displacement or death of numerous koalas.
The combination of these factors makes koalas highly vulnerable to the effects of climate change. Conservation efforts are crucial to protect this iconic species, with researchers working to identify crucial forest stands, dubbed "climate refugia," that must be preserved to ensure the long-term survival of koala populations.
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They are territorial and non-social
Koalas are territorial and non-social creatures. They are mostly active at night (nocturnal) and during dawn and dusk. They live within a network of overlapping home ranges, which allows for contact with other koalas for mating purposes. Male koalas will try to establish dominance over the home ranges of female koalas during the mating season.
Koalas are solitary animals, and adults will generally only tolerate each other when breeding. They are known to be picky eaters, consuming eucalyptus leaves from only a small number of eucalypt species. They also show a preference for leaves at the top of the tallest trees, which contain more liquid and nutrients.
The koala's diet of eucalyptus leaves is toxic to most animals, but koalas have a specialised digestive system that allows them to break down these toxins. They also obtain most of their water intake from the leaves, which can contain up to 50% water. This means that they rarely need to descend from their trees to drink water, except during periods of extreme heat or drought.
The koala's territorial nature is further emphasised by the presence of scent glands on mature males, which they use to mark their territories by rubbing them on trees. These scent glands are visible as bald patches on the chests of male koalas. The large head and strong claws of the koala also contribute to its territorial behaviour, as they use these features to establish dominance and defend their home ranges.
While koalas are not inherently social, their overlapping home ranges allow for some level of interaction and breeding. However, their territorial nature and preference for solitude are key aspects of their behaviour and contribute to their survival strategies in the wild.
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Frequently asked questions
Koalas eat eucalyptus leaves and occasionally leaves from other plant species, such as lophostemon, melaleuca and corymbia trees.
Eucalyptus leaves are toxic to most animals. Koalas have a specialised digestive system that allows them to break down the toxins in the leaves.
Dingoes and large owls are known to prey on koalas. Birds of prey such as Wedge-tailed Eagles also hunt young koalas.
