Common Myna
Acridotheres tristis
The common myna (Acridotheres tristis) is a medium-sized invasive bird native to Asia, deliberately introduced to Australia at Melbourne between 1862 and 1872 to control garden pests, then later introduced to north-eastern Queensland cane fields in 1883, to combat insect pests, particularly plague locusts and cane beetles. Both introductions are now regarded as a failure of biological control: the species is widespread throughout eastern Australia, from western Victoria in the south to Cairns in the north, thriving in urban and suburban environments across that range. It has not established in South Australia, Western Australia or Tasmania, where it is a declared and prohibited pest animal, with management focused on preventing establishment; by contrast it is already well established in the ACT, where it is managed rather than excluded. The bird's aggressive scavenging and competitive behaviour make it a significant ecological threat: it actively drives native species out of nesting hollows and has been known to destroy their eggs and chicks. Identification is straightforward: the Common Myna is brown with a black head, a yellow bill, legs and bare eye skin, and shows large white wing patches in flight, with birds measuring 23-26 centimetres in length.
For effective control and prevention, professional pest management is recommended.
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Common Myna At-A-Glance
Key facts and characteristics
Complete Common Myna Guide
Professional identification and control information
The common myna (Acridotheres tristis) is a medium-sized invasive bird native to Asia, deliberately introduced to Australia at Melbourne between 1862 and 1872 to control garden pests, then later introduced to north-eastern Queensland cane fields in 1883, to combat insect pests, particularly plague locusts and cane beetles. Both introductions are now regarded as a failure of biological control: the species is widespread throughout eastern Australia, from western Victoria in the south to Cairns in the north, thriving in urban and suburban environments across that range. It has not established in South Australia, Western Australia or Tasmania, where it is a declared and prohibited pest animal, with management focused on preventing establishment; by contrast it is already well established in the ACT, where it is managed rather than excluded. The bird's aggressive scavenging and competitive behaviour make it a significant ecological threat: it actively drives native species out of nesting hollows and has been known to destroy their eggs and chicks. Identification is straightforward: the Common Myna is brown with a black head, a yellow bill, legs and bare eye skin, and shows large white wing patches in flight, with birds measuring 23-26 centimetres in length.
Identification
How to accurately identify Common Myna
Lookalike Species
The species most often mistaken for the Common Myna is the native Noisy Miner (Manorina melanocephala), a honeyeater that shares a black head, yellow eye-patch and yellow bill but is otherwise a different bird in a different family (BirdLife Australia). The Noisy Miner's body is grey rather than brown, it lacks the Common Myna's white wing patches, and its calls are sharp, piping and chattering compared with the myna's lower, rolling churr (Australian Museum).
In parts of Western Australia the Common Myna can also be confused with the native Yellow-throated Miner; the WA Department of Primary Industries and Regional Development's biosecurity alert material for this species covers that identification risk (DPIRD WA). Correct identification matters because one bird is a declared pest and the other is a protected native species.
Physical Description
The Common Myna (Acridotheres tristis) is a medium-sized, chocolate-brown bird around 23–26 cm long with a glossy black head and throat, a bright yellow bill, yellow legs, and bare yellow skin around and behind the eye (Australian Museum). In flight it reveals large white patches on the wings and a white tip to the tail, features that are visible even at a distance and remain one of the most reliable ways to separate it from other brown Australian birds (Museums Victoria).
On the ground it moves with a distinctive hopping gait rather than walking, and its calls are a rolling, churning series of harsh notes rather than a clear song, often delivered from rooftops or overhead wires. It is a member of the starling family (Sturnidae), unrelated to Australia's native honeyeaters despite the common confusion with them.
Biology & Lifecycle
Understanding Common Myna biology and development
Diet And Foraging
The Common Myna is an omnivorous opportunist, eating fruit, grain, nectar, invertebrates such as beetle larvae and caterpillars, small vertebrates, and human food scraps, garbage and pet food left outdoors (PestSmart). This dietary flexibility, combined with a preference for foraging on open ground and mown lawns, is a major reason it thrives in Australian towns and cities rather than being confined to bushland.
Life Cycle And Breeding
Common Mynas are monogamous and are believed to pair for life, breeding from October to March and typically raising two broods in a season (Australian Museum). A clutch usually holds four to six eggs, incubated by the female for around 17–18 days, with chicks fledging at 22–24 days and becoming independent roughly three weeks later (PestSmart).
Pairs compete fiercely for nesting cavities, and physical contests between rival pairs over hollows or building cavities can be prolonged, with the losing pair forced to relocate (Australian Museum).
Roosting And Social Structure
Outside the breeding season Common Mynas gather in large communal roosts, sometimes numbering in the thousands, typically in dense trees near urban centres (Australian Museum). These highly intelligent, adaptable birds have adjusted successfully to human-modified environments across the eastern seaboard, which is a large part of why control is difficult once a population is established (PestSmart).
Lifecycle Details
Egg Stage
The breeding season in Australia typically runs from September to March, but they can breed year-round in favourable conditions. The female lays a clutch of 4-5 glossy, pale blue eggs. The nest is an untidy, large cup or dome made of grasses, leaves, plastic, and other rubbish, usually built within a cavity. Nests are commonly found in tree hollows, roof voids, wall cavities, and under bridges. Incubation is performed by both parents and lasts for 13-18 days.
Adult Stage
Common Mynas reach sexual maturity at around one year of age. They are monogamous and form long-term pair bonds. Their lifespan in the wild can be up to 12 years, though 4-6 years is more typical. Their intelligence and adaptability contribute to their high survival rate in urban environments. As adults, they often join large communal roosts at night, which can number in the hundreds or even thousands.
Pupal Stage
This stage is the 'fledgling' phase. The young birds leave the nest approximately 20-27 days after hatching. They are able to fly but are still dependent on their parents for food and protection for several more weeks. During this time, they learn essential foraging and social skills. The family group often stays together, and fledglings can be seen following their parents, begging noisily for food.
Larval Stage
This stage is the 'nestling' phase. After hatching, the chicks are featherless, blind, and completely dependent on their parents. Both the male and female are highly attentive, feeding the chicks a diet rich in insects to fuel their rapid growth. The nestling period is characterised by constant feeding and rapid development. The parents are extremely aggressive in defending the nest site against any perceived threat, including other birds, pets, and humans.
Seasonal Cycle
Breeding activity peaks in spring and summer. In autumn and winter, they form large, noisy communal roosts in dense trees or on man-made structures.
Development Time
From egg-laying to the fledglings leaving the nest is a rapid process, taking only 5-7 weeks.
Reproduction Rate
Highly prolific. They can raise two or sometimes three broods in a single breeding season, especially in urban areas with abundant food. This high reproductive rate allows their populations to grow and spread rapidly.
Generations Per Year
Typically two generations per year, but can be more in optimal conditions.
Maximum Temperature
Highly tolerant of hot conditions found in Australian cities.
Minimum Temperature
Their range is limited by severe cold and frost, but they are adapting to cooler climates like Melbourne and Canberra.
Optimal Temperature
They thrive in a wide range of climates but are most successful in subtropical and warm temperate zones.
Environmental Factors
Their success is directly linked to human modification of the landscape. They thrive in environments with open grassy areas for foraging (like parks and lawns), abundant food scraps, and ample nesting cavities (buildings, exotic trees).
Habitat & Distribution
Where Common Myna lives and thrives
Hiding Spots
- Nesting in roof voids, wall cavities, and under eaves.
- Communal roosting at night in dense, leafy trees (often exotic species like palms or plane trees), or on building ledges and bridges.
- They are not a species that hides; they are typically bold and conspicuous.
Microhabitat
Their microhabitat is the interface between open foraging grounds (lawns) and nesting/roosting sites (trees and buildings).
Nesting Behavior
They are cavity nesters. In their native range, they use tree hollows. In Australia, they exploit the lack of competition and use not only tree hollows but also any suitable cavity in buildings, such as roof voids, eaves, wall cavities, and exhaust fans. They fill the cavity with a large, untidy collection of grass, leaves, feathers, and rubbish.
Preferred Habitats
- Urban and suburban areas: parks, gardens, shopping centre car parks, and outdoor cafes.
- Agricultural lands, especially around livestock and buildings.
- Open woodlands and coastal areas.
- They thrive in human-modified landscapes and are less common in dense, undisturbed forests.
- Roadsides and rubbish tips are also favoured habitats.
Humidity Preference
Tolerate a wide range of humidity levels.
Habitat Modification
Their main modification is filling nesting cavities with large amounts of material and displacing native fauna.
Nesting Requirements
A protected cavity is the primary requirement. This can be a natural tree hollow or any man-made equivalent, which is why they are so successful in urban areas.
Temperature Preference
They are highly adaptable but prefer warm to temperate climates.
Distribution Patterns
States
Well-established along the east coast of Australia, from northern Queensland south through New South Wales and into Victoria. There are also significant populations around major centres like Canberra, Adelaide, and Perth, and they are spreading in Tasmania.
Native Range
Native to southern and Southeast Asia.
Climate Zones
- Tropical
- Subtropical
- Temperate
- Mediterranean
Urban Vs Rural
Primarily an urban and suburban pest. Their populations are densest in cities and towns. They are also found in agricultural areas but are less common in extensive, undisturbed natural bushland.
Current Spread
Their range is continually expanding. They are moving further inland from the coast, colonising new towns along transport corridors, and adapting to cooler climates in southern Australia.
Introduced Range
Introduced globally to many countries, including Australia, New Zealand, South Africa, and various Pacific islands. It is listed as one of the world's most invasive species.
Limiting Factors
Dense, intact forest habitat limits their spread. In the past, colder climates were a limiting factor, but they appear to be adapting to these conditions.
Spread Mechanism
Natural spread is slow, through short-distance flights. Long-distance spread is often human-assisted, with birds being transported, intentionally or accidentally, by vehicles, trains, or ships.
Introduction History
Intentionally introduced to Melbourne in 1862 and subsequently to other areas, including northern Queensland sugarcane fields, in an ill-fated attempt to control insect pests. The populations then spread from these release points.
Behavior & Diet
Common Myna behavioral patterns and feeding habits
Parental Care
Both parents are heavily involved in incubating the eggs, feeding the young, and defending the nest.
Mating Behavior
Mynas are monogamous and form strong pair bonds. Courtship involves head-bobbing, bowing, and specific calls.
Social Behavior
Highly social birds. They are typically seen in pairs or small family groups during the day, but they congregate in large, noisy flocks at communal roosts at night. They have a complex social structure and are capable of learning and vocal mimicry.
Activity Pattern
Diurnal. They are active from sunrise to sunset. They spend much of their day foraging on the ground in open areas. In the late afternoon, they gather in increasingly large groups before flying to a communal roosting site for the night.
Foraging Behavior
An opportunistic omnivore. Their primary foraging technique is walking or hopping on the ground, probing the soil and grass for insects and other invertebrates. They will also forage in trees for fruit and nectar and are notoriously bold scavengers of human food waste in outdoor cafes, parks, and bins.
Defensive Behavior
Very aggressive and bold. They will collectively 'mob' predators like cats, dogs, and birds of prey to drive them away. They show little fear of humans.
Dispersal Behavior
Young birds disperse from their parents' territory after a few months. They are not strong long-distance flyers, so their spread across the landscape is often a gradual, creeping invasion from established population centres.
Territorial Behavior
Extremely territorial, especially during the breeding season. A pair will aggressively defend their nesting site and a small surrounding feeding area from other mynas and, significantly, from native birds. Their aggression is a major factor in their displacement of native species.
Communication Methods
Highly vocal, with a wide repertoire of calls including chirps, squawks, whistles, and gurgles. They are also capable mimics of other bird calls and even human-made sounds. Body language, such as head-bobbing and strutting, is also used in social interactions.
Dietary Preferences
The common myna is an omnivorous, highly adaptable forager. The Australian Museum describes it as an accomplished scavenger, feeding on almost anything, including insects, fruits and vegetables, scraps, pets' food and even fledgling sparrows, and notes that its fruit-eating habits make it a pest of fruit trees, especially figs. The Centre for Invasive Species Solutions similarly records that common mynas can cause serious damage to ripening fruit such as grapes and blueberries, making orchards and market gardens a target wherever the species has established. Around homes, mynas scavenge freely through parks, gardens, rubbish bins and picnic areas, and readily take pet food left outdoors; the ACT Government advises that limiting access to pet food left outside can help reduce myna numbers in a suburb. Beyond crop and food-source competition, the species' opportunistic foraging extends to predation on the eggs and chicks of smaller native birds and to fierce contests over the same tree hollows that native species need for breeding, as BirdLife Australia notes mynas nest in hollows also used by native birds, competing aggressively for the same cavities, compounding the ecological threat posed by its diet and feeding behaviour.
Health Risks
Health concerns associated with Common Myna
Always consult healthcare professionals for medical concerns related to pest exposure.
Disease Transmission
The main disease risk linked to Common Mynas is histoplasmosis, a lung infection caused by inhaling spores of the fungus Histoplasma capsulatum that can grow in accumulated droppings, particularly where birds roost or nest inside roof voids, sheds or wall cavities over long periods. Most healthy people who are exposed have no symptoms, but the infection can be more serious for infants, older people and anyone with a weakened immune system, and disturbing dry, dusty droppings during clean-up is the main route of exposure.
Parasites And Nuisance
Bird mites associated with myna nests can migrate into buildings when a nest is removed or the birds move on, causing itchy bites and skin irritation in occupants, although these mites are not established vectors of disease in humans. Large roosts also generate substantial noise, odour and dropping accumulation under roost trees, which is more often a nuisance and hygiene issue for households and councils than a direct medical hazard.
Economic Impact
Financial costs and economic effects of Common Myna
Wider Costs
Common Mynas compete with native hollow-nesting birds, possums and gliders for the limited tree hollows both groups depend on, and the species is recognised internationally as one of the world's most damaging invasive species partly for this reason (DPIRD WA). Local councils and Landcare groups in New South Wales and the ACT also fund ongoing trapping and monitoring programs targeting established populations, representing a recurring public cost rather than a one-off eradication expense; South Australia's public effort is currently weighted toward preventing the species from establishing at all, through monitoring and public reporting of sightings rather than managing an existing population (PIRSA).
Agricultural And Horticultural Damage
Common Mynas damage horticultural crops, particularly soft and stone fruit, grapes and figs, by pecking and feeding directly on ripening produce, and they are also recorded feeding in cereal crops and stored grain (PestSmart; Business Queensland). Losses vary widely with location, crop type and flock size and have not been reliably quantified in dollar terms for Australia, so growers are better served treating the risk as crop- and season-specific rather than relying on a single national cost figure.
Detection & Signs
Early warning signs of Common Myna presence
Behavioural Cues
Aggressive chasing of smaller native birds away from hollows, bird feeders or lawns, and confident ground-foraging in pairs or small groups even close to people, are typical behavioural indicators of Common Myna presence rather than a native species. Confirming the black head, brown (not grey) body and white wing flashes before taking any action is essential given the legal distinction from the protected Noisy Miner.
Signs Of Activity
The clearest sign of a Common Myna problem is a large, noisy communal roost forming in dense trees near buildings at dusk, often accompanied by a strong smell and heavy droppings on the ground and parked cars beneath the roost trees. Around a property, look for nests built from twigs, grass and rubbish stuffed into roof eaves, wall cavities, downpipes or tree hollows, since the species is a cavity nester that readily uses artificial structures as well as natural hollows (PestSmart).
Prevention
Proactive strategies to prevent Common Myna infestations
Excluding Nest Sites
The most effective long-term prevention is denying Common Mynas cavities to nest in: seal gaps in eaves, roof voids, downpipes and wall vents, fit hollow-limbed trees with one-way exclusion devices once mynas are confirmed absent, and block access to roof spaces before the October–March breeding season begins (PestSmart).
Reducing Food Access
Because the species is an opportunistic scavenger, removing easy food sources reduces its incentive to settle on a property: keep pet food indoors, secure garbage and compost, collect fallen fruit promptly under fruit trees, and avoid leaving food scraps on outdoor tables. These measures do not eliminate an established population but make a site markedly less attractive to newly forming flocks.
Control Methods
Effective treatment options for Common Myna control
Trapping Programs
Cage or funnel traps such as the Tidemann trap have been used in community and council-run control programs across eastern Australia (PestSmart). The Common Myna is not protected as native wildlife in any Australian state or territory, but that does not make all handling of the species automatically lawful: keeping, transporting, selling or releasing live birds is itself prohibited in South Australia and the ACT, and every state and territory's animal welfare law governs how a trapped bird may be killed, regardless of its pest status. Anyone planning a trapping program should confirm current requirements with the relevant state or territory department before starting. Any native bird caught accidentally, including a Noisy Miner, must be released immediately and unharmed, since trapping or harming it would be an offence.
Humane And Evidence Considerations
The RSPCA does not encourage unsupervised community trapping-and-killing programs, arguing the evidence for the scale of Common Myna impact on native wildlife is still contested, and recommends that any lethal control be government-supervised, follow clear humane-killing standards, and be paired with monitoring of actual ecological outcomes rather than just myna numbers removed (RSPCA). Anyone trapping mynas should follow their state's animal welfare code for euthanising pest birds humanely rather than assuming legality alone covers welfare obligations.
Nest Removal And Habitat Modification
Removing nests during the breeding season, before eggs hatch, and modifying habitat by blocking nest cavities and reducing food and water availability are recommended alongside or instead of trapping, particularly for small or newly establishing populations (PestSmart).
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Seasonal Patterns
Common Myna seasonal activity and management timing
Breeding Season Activity
Common Mynas breed from October to March in southern and eastern Australia, spanning spring into late summer, which is when nesting, territorial aggression toward other hollow-users, and nest-related property damage peak (Australian Museum). Early in this window, before eggs hatch, is the most effective time to remove any new nest that appears, since acting before eggs hatch avoids the welfare and legal complications of disturbing nestlings; exclusion measures such as sealing roof and wall cavities are best completed beforehand, in the months leading up to October.
Non Breeding Roosting Period
Outside the breeding months, particularly through autumn and winter, mynas form large communal night roosts in dense urban trees, which is when noise and dropping-accumulation complaints to councils typically rise even though breeding-related conflict has eased. Flock size at these roosts can grow substantially as birds from a wider area congregate, making this period a practical time to conduct roost counts before planning a control program.
Legal Considerations
Legal requirements for Common Myna control in Australia
Avoiding Misidentification Offences
Because the native Noisy Miner (Manorina melanocephala) is protected in every Australian state and territory, killing, trapping or harming one in the mistaken belief it is a Common Myna is an offence, regardless of the intention behind it (Australian Museum). Anyone running a trapping program should be confident of the identification differences described above — brown versus grey body, white wing patches versus none — before any bird is euthanised, and must release any native bird caught by accident immediately.
Introduced Status And State Regulation
The Common Myna (Acridotheres tristis) is an introduced species in Australia, first released near Melbourne between 1862 and 1872 and again in north Queensland cane districts in 1883, and it carries no native protection under any state or territory wildlife act (Australian Museum). Regulation still varies by state: it is a prohibited declared pest under Western Australia's Biosecurity and Agriculture Management Act 2007, with sightings reportable to DPIRD (DPIRD WA); it is illegal to keep, transport, sell or release the species in South Australia under the Landscape South Australia Act 2019 (PIRSA); the ACT declared it a prohibited pest animal on 21 June 2021 under the Pest Plants and Animals Act 2005, the first Australian jurisdiction to do so (ACT Government); and in Queensland it is not a prohibited or restricted invasive animal under the Biosecurity Act 2014, though landholders still carry a general biosecurity obligation to limit its spread (Business Queensland). Always confirm current requirements with the relevant state department before starting a control program, since declared-pest lists are updated periodically.
Frequently Asked Questions
Common questions about Common Myna
Are Common Mynas and Noisy Miners the same bird?
No, they are completely different species and this is a very common point of confusion. The Common Myna (*Acridotheres tristis*) is an introduced pest from Asia. It has a chocolate-brown body, a black head, and a yellow beak and eye-patch. The Noisy Miner (*Manorina melanocephala*) is a native Australian honeyeater. It is mostly grey, with a white belly, a black cap on its head, and also has a yellow beak and eye-patch. While both are very common in urban areas and can be aggressive, the Noisy Miner is a protected native species, whereas the Common Myna is an invasive pest. The easiest way to tell them apart is the body colour: if it's brown, it's a Myna; if it's grey, it's a native Miner.
Why are Common Mynas considered such a bad pest?
Common Mynas are considered a major pest for two main reasons: their environmental impact and their urban nuisance value. Environmentally, they are a significant threat to Australia's native biodiversity. They are cavity nesters and are extremely aggressive, out-competing native birds like parrots, rosellas, and kookaburras for scarce nesting hollows. They will physically evict native birds, destroy their eggs, and kill their chicks. In urban areas, they become a nuisance by forming massive, noisy communal roosts in trees and on buildings, which create incredible amounts of mess from droppings. They scavenge aggressively at outdoor cafes and can carry bird mites from their nests into people's homes. Their combined impact on both wildlife and human amenity is what makes them one of Australia's most disliked pests.
How can I stop mynas from nesting in my roof?
The only guaranteed way to stop mynas from nesting in your roof is through physical exclusion. You must meticulously inspect your roofline, eaves, and external walls to find every single hole or gap they could use to get in. Mynas can squeeze through surprisingly small openings. Once you have identified all potential entry points, you must seal them permanently with durable materials. Use strong wire mesh (not chicken wire, which they can push through), metal flashing, wood, or expanding foam to block every hole. Pay special attention to gaps where tiles meet the gutter, broken roof tiles, and vents. If a nest is already active, you may need a professional to remove it first, as the parents can be very aggressive and the nest will be full of parasites.
What is the most effective way to control Common Mynas on my property?
A multi-faceted approach is most effective. First, remove any incentives for them to be there: do not leave pet food out, secure your bins, and don't feed them. Second, modify the habitat by blocking their access to all potential nesting sites on your house. Third, for reducing the local population, humane trapping is the most effective method recommended by experts and community groups. Special cage traps are designed to capture mynas without harming other birds. Many local councils or Landcare groups run community trapping programs and can provide advice, loan traps, and assist with the humane dispatch of captured birds, which is a legal requirement. A single person trapping has a limited effect, but a coordinated neighbourhood effort can significantly reduce their numbers and impact.
I have a myna nest in my roof. What should I do about bird mites?
A myna nest in your roof is a ticking time bomb for a bird mite infestation. Bird mites live in the nest and feed on the blood of the birds. When the myna chicks fledge and the family abandons the nest, the mites' food source is gone. Hungry and searching for a new host, they will migrate from the nest and enter your house through tiny cracks in the ceiling, light fittings, and vents. To prevent this, the nest must be removed, but this must be done carefully. It is best to engage a professional pest controller. They can treat the nest and surrounding area with a suitable insecticide to kill the mites *before* removing the nest material. This prevents the mites from scattering into your home during the removal process. After the nest is gone, the entry point the mynas were using must be permanently sealed to prevent re-infestation.
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Visual identification guide for Common Myna
Images of Common Myna showing key identifying features: