Leslie Massey
Flying foxes, also known as fruit bats, are megabats native to Australia. They are the largest bats in the world, with a wingspan of up to 1.5 metres and a head and body length of 40 cm. In Australia, the grey-headed flying fox is the largest bat species, weighing up to 1.1 kg with a wingspan of over one metre. They are social animals with excellent eyesight and a highly developed sense of smell, which they use to locate food at night. They are important for the ecosystem as they pollinate flowers and disperse seeds, ensuring the survival of the Australian Eucalypt forests. However, they are also a source of disease and are often perceived as a nuisance, leading to conflicts with humans.
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What You'll Learn
- The grey-headed flying fox is the largest in Australia
- They have a wingspan of up to 1.5 metres and weigh up to 1.1kg
- They are a source of disease, carrying the lyssavirus, Hendra and Nipah viruses
- They are nomadic, travelling vast distances of over 50km in search of food
- They are a keystone species, critical to the health of the Australian ecosystem
The grey-headed flying fox is the largest in Australia
The grey-headed flying fox, scientifically known as Pteropus poliocephalus, is the largest bat in Australia. It is a megabat native to Australia and is found in the south-eastern forested areas of the country, east of the Great Dividing Range. Its range extends from Bundaberg in Queensland to Geelong in Victoria, with outlying colonies in Ingham, Finch Hatton, and Adelaide.
Grey-headed flying foxes have a wingspan of up to 1 meter (3 feet 3 inches) and weigh up to 1 kilogram (2.2 pounds). Their weight typically varies between 600 and 1,000 grams (21 to 35 ounces), with an average weight of 700 grams (25 ounces). The combined length of their head and body is between 230 and 290 millimeters. The forearm length ranges from 138 to 180 millimeters, while their ears measure 30 to 37 millimeters from tip to base.
These bats have a dark grey body with a light grey head, separated by a reddish-brown collar. Their fur is long and streaked with grey, and the collar around their neck is golden orange. Grey-headed flying foxes are nocturnal and navigate using their keen eyesight, as they cannot echolocate. They consume a variety of food, including fruit, flowers, nectar, leaves, and occasionally insects like cicadas.
Grey-headed flying foxes are facing a serious population decline due to various threats such as habitat loss, competition with other flying fox species, and mass die-offs caused by extreme temperatures. They are also perceived as a nuisance in urban environments and face negative public perception due to the potential transmission of zoonotic viruses. Conservation efforts are in place to protect this vulnerable species.
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They have a wingspan of up to 1.5 metres and weigh up to 1.1kg
Flying foxes are the largest flying mammals in Australia. They are critical to the survival of the Australian Eucalypt forests and the overall health of the ecosystem. They are the largest bats in the world, with a wingspan of up to 1.5 metres and weighing up to 1.1kg. They are native to Australia and are found in the south-eastern forested areas of the country, east of the Great Dividing Range. Their range extends from Bundaberg in Queensland to Geelong in Victoria, with outlying colonies in Ingham and Finch Hatton in the north, and Adelaide in the south.
Grey-headed flying foxes are the largest flying foxes in Australia. They weigh up to 1.1kg and have a wingspan of up to one metre. They are a vulnerable species, with a declining population due to habitat clearing and conflict with humans. They are perceived as a nuisance in urban environments and are also a source of zoonotic diseases such as the Hendra virus, Australian bat lyssavirus, and Menangle virus. However, they are important pollinators and seed dispersers, contributing to the creation of new forests.
The size of flying foxes makes them impressive and powerful fliers. They can fly at speeds of 35-40 kilometres per hour and travel over 50 kilometres from their camps to feeding areas. They are nomadic, travelling vast distances across eastern Australia in search of food. They are social animals and communicate using a variety of vocalisations with specific meanings associated with behaviours such as mating, locating their young, and defending their territory.
The wingspan of flying foxes, reaching up to 1.5 metres, is a remarkable feature that contributes to their ability to cover long distances and play a crucial role in maintaining the health of the Australian ecosystem. Their weight, of up to 1.1kg, is also significant, reflecting their size and presence as the largest bats in the world. This weight, combined with their wingspan, gives them a formidable presence in the skies and makes them an important part of Australia's natural heritage.
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They are a source of disease, carrying the lyssavirus, Hendra and Nipah viruses
Flying foxes are a source of disease, carrying viruses that can be fatal to humans. These include the Australian bat lyssavirus, Hendra virus, and Nipah virus.
The Australian bat lyssavirus, also known as ABL, is a rabies-like virus that can be transmitted from bats to humans. While the chance of contracting this virus is extremely small, it has been known to cause human deaths. Bat caregivers are vaccinated against rabies as a precaution.
The Hendra virus, or HeV, has caused lethal disease outbreaks in humans and horses in Australia. Flying foxes are the wildlife reservoir from which the Hendra virus was first isolated in 1996. The virus is highly pathogenic and has resulted in seven known human deaths.
The Nipah virus, or NiV, is also transmitted by flying foxes and has affected more people, with over 100 attributed fatalities. This virus is serologically cross-reactive with the Hendra virus, and both viruses induce syncytial cells in vascular tissues, primarily affecting the respiratory system.
In addition to these three viruses, flying foxes have also been associated with the Menangle virus, which caused a zoonotic disease in pigs and humans in New South Wales in 1997.
While flying foxes are a source of these diseases, it is important to note that they play a crucial role in maintaining healthy forest ecosystems. They are native to Australia and are the largest bats in the country. They are known for their long lifespans and low reproductive rates, with females of most species producing only one offspring per year. As a result of habitat clearing and other threats, the number of flying foxes in Australia is declining.
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They are nomadic, travelling vast distances of over 50km in search of food
Flying foxes are nomadic, travelling vast distances in search of food. They can move across eastern Australia, covering over 50 km in their search for food sources. Some species, like the Grey-headed Flying-fox, are known to fly up to 100 km away from their camps at night to find food, although most prefer to stay within 20 km of their camp. On average, Grey-headed Flying-foxes fly about 1,500 km a year between camps, with some individuals travelling even further.
The nomadic behaviour of flying foxes is driven by their need to locate specific food resources, which are often only available for short periods. They feed on fruit, flowers, nectar, and leaves, with eucalypt blossoms and pollen being their preferred food sources. This preference for eucalypt leads them to native forests, where they play an important ecological role. As they feed at night, they inadvertently pollinate flowers and disperse the seeds of native trees, contributing to the maintenance of healthy forests.
The Little Red Flying-fox, another species found in Australia, also exhibits nomadic behaviour. They are known to gather in large numbers, with camps supporting over a million animals when nectar is abundant. This behaviour demonstrates the strong influence of food availability on the movement patterns of flying foxes.
The Grey-headed Flying-fox, the largest bat in Australia, has a range extending from Queensland to Victoria and even further south to Adelaide. Their distribution is mostly within 200 km of the coast, and they are known to frequent urban areas like Brisbane, Sydney, and Melbourne. In these cities, they have been observed feeding on Moreton Bay fig trees in parks and gardens, highlighting their adaptability in foraging for food.
The nomadic nature of flying foxes is an essential aspect of their survival strategy. By travelling long distances, they can access the resources they need to sustain themselves and play a vital ecological role in the process. However, their nomadic behaviour can also bring them into conflict with humans, particularly when they feed on cultivated orchard fruits or roost in urban areas.
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They are a keystone species, critical to the health of the Australian ecosystem
Flying foxes are a keystone species, meaning that many other species of plants and animals rely on them for their survival and well-being. They are native to Australia and are the only species that pollinate trees at night, when most Australian trees need to be pollinated. They are also the only mammalian nectarivore and frugivore to occupy substantial areas of subtropical rainforests, so they are of key importance to those forests.
Grey-headed flying foxes, in particular, are important to healthy forest ecosystems because they pollinate and disperse the seeds of many important tree species. They feed on the fruit, flowers, and pollens of around 187 plant species, including eucalypt, Ficus, and other rainforest trees. They are sequential specialists, meaning they feed on a variety of foods.
Flying foxes are also important in helping to drive biodiversity. They consume 25-35% of their body weight daily, eating fruit, flowers, nectar, leaves, and occasionally insects. Their preference for cultivated orchard fruits sometimes brings them into conflict with humans, but they are critical to the health of the Australian ecosystem.
In addition to their ecological importance, flying foxes have cultural significance to Indigenous Australians. They appear in traditional art, folklore, and weaponry, and their fur and teeth were used as currency in the past. Some cultures still use their teeth as currency today.
Despite their importance, flying foxes are under threat from habitat loss, climate change, and negative public perception. Populations of both the grey-headed and spectacled flying fox species have declined in recent decades, and they are now listed as "'Vulnerable'" on the IUCN Red List of Threatened Species. It is important to protect these gentle and intelligent creatures, as they are vital to the health of the Australian ecosystem.
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Frequently asked questions
They have a head and body length of about 23 cm to 29 cm, and a wingspan of over 1 metre.
Grey-headed flying foxes, the largest species in Australia, weigh up to 1.1 kg.
They can travel over 50 kilometres in one night.
They consume 25–35% of their body weight daily.
They are vegetarians that feed on the fruit of over 50 native rainforest trees and vines. They also eat flowers, nectar, leaves, and occasionally insects.
