Common Myna
Acridotheres tristis
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Common Myna At-A-Glance
Key facts and characteristics
Complete Common Myna Guide
Professional identification and control information
Identification
How to accurately identify Common Myna
Identification information is being compiled.
Biology & Lifecycle
Understanding Common Myna biology and development
Biology information is being compiled.
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
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.
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.
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.
Humidity Preference
Tolerate a wide range of humidity levels.
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.
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
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.
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.
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.
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.
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.
Dietary Preferences
Diet information is being compiled.
Health Risks
Health concerns associated with Common Myna
Always consult healthcare professionals for medical concerns related to pest exposure.
Health risks information is being compiled.
Economic Impact
Financial costs and economic effects of Common Myna
Economic impact information is being compiled.
Detection & Signs
Early warning signs of Common Myna presence
Detection information is being compiled.
Prevention
Proactive strategies to prevent Common Myna infestations
Prevention information is being compiled.
Control Methods
Effective treatment options for Common Myna control
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Professional Services
Professional services information is being compiled.
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Seasonal Patterns
Common Myna seasonal activity and management timing
Seasonal patterns information is being compiled.
Legal Considerations
Legal requirements for Common Myna control in Australia
Legal considerations information is being compiled.
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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Image Gallery
Visual identification guide for Common Myna
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