Invasive Pest Bird Species by Continent: A Global Reference Guide

Invasive pest bird species are a global biosecurity challenge. The same handful of highly adaptable species — starlings, mynas, sparrows, pigeons — have been introduced, intentionally or accidentally, to regions far outside their native ranges on every inhabited continent. In their new environments, they outcompete native wildlife, damage agriculture, spread disease and impose significant costs on public health and infrastructure.

This reference guide lists the principal invasive pest bird species confirmed by government biosecurity agencies, conservation authorities and peer-reviewed research in each major region. It is intended as a practical resource for land managers, biosecurity officers, conservation practitioners and operators evaluating pest management requirements.

Australia has some of the world's most stringent biosecurity legislation, and several introduced bird species are formally listed as pests under state and territory legislation.

Key authority: Department of Agriculture, Fisheries and Forestry (DAFF); state biosecurity agencies.

New Zealand's island ecology makes it particularly vulnerable to introduced species. Several bird species introduced by European settlers are now formally managed as pests.

Key authority: Biosecurity New Zealand (MPI); regional councils.

Most European countries distinguish between native species (protected) and introduced or feral populations of otherwise native species (managed as pests). The following are the principal species subject to active management programs, several of which are listed under EU Regulation 1143/2014 on invasive alien species.

Key authority: European Commission Regulation (EU) 1143/2014 on invasive alien species; national environment agencies.

The United States and Canada have well-documented invasive bird problems, primarily driven by deliberate 19th-century introductions. The US Fish and Wildlife Service and USDA Wildlife Services manage several species under federal programs.

Key authority: USDA Wildlife Services; US Fish and Wildlife Service; Environment and Climate Change Canada.

Introduced European species have established across much of Latin America, with additional pressure from escaped cage birds that have formed feral populations.

Key authority: SENASA (Argentina); MAPA (Brazil); national biosecurity agencies.

Africa's pest bird situation is complex: many of the most damaging species are native to the continent but have expanded dramatically due to agricultural development and urbanisation. A smaller number of introduced species are also established.

Key authority: FAO (for quelea management); national agriculture ministries; IUCN SSC Invasive Species Specialist Group.

Asia is both the native range of several globally invasive species (mynas, sparrows) and the recipient of introduced populations from other regions. Urban expansion has dramatically increased feral populations of several species across the continent.

Key authority: National agriculture ministries; IUCN SSC Invasive Species Specialist Group; regional biosecurity networks.

Pacific island ecosystems are among the most vulnerable to invasive species on Earth. Small land areas, high endemism and limited native predator diversity mean that introduced birds can cause catastrophic and irreversible harm.

Key authority: IUCN SSC Invasive Species Specialist Group; Pacific Invasives Initiative; national biosecurity agencies.

Five species appear on pest lists in virtually every inhabited region of the world. They share key traits: high reproductive rates, dietary flexibility, tolerance of human-modified environments and aggressive competitive behaviour toward native species.

Native range: Rock dove of Europe, North Africa and South Asia
Invasive range: Every inhabited continent and most inhabited islands
Global population estimate: 260–400 million

Biology and Identification

The feral pigeon is descended from the rock dove (Columba livia), domesticated by humans for food and messaging for over 5,000 years. Escaped and released birds have established feral populations on every inhabited continent. Plumage is highly variable — from the classic blue-grey with iridescent neck and two black wing bars, to white, brown, chequered and pied forms — a direct result of centuries of selective breeding. Adults weigh 250–550 g with a wingspan of 60–68 cm.

Key identification features:

• Stocky build with small head and short neck
• Rapid, direct flight with regular wingbeats
• Characteristic head-bobbing walk
• Cooing call: oo-roo-coo or coo-roo-c'too-coo
• Often confused with native doves and pigeons — AI species identification is essential in management contexts

Reproductive Biology

Feral pigeons are among the most reproductively prolific birds in the world. A single breeding pair can produce up to 6 clutches per year, each of 1–2 eggs, with an incubation period of 17–19 days. Young (squabs) fledge at 25–32 days. In temperate urban environments, breeding occurs year-round where food is available. A population left unmanaged can double in size within 12 months.

Why It Succeeds

The feral pigeon's success as an invasive species is inseparable from its long association with human infrastructure. Buildings replicate the cliff faces of its ancestral habitat. Ledges, roof cavities, bridge structures and air conditioning units serve as nest sites. Urban food waste provides a reliable, high-calorie food source. The species is highly tolerant of human presence, making deterrence difficult and population management challenging.

Economic and Public Health Impact

Management Considerations

Feral pigeon populations are highly resilient to non-lethal management. Deterrents (spikes, netting, gels) displace birds rather than reduce populations. Fertility control (OvoControl) reduces reproduction but requires sustained, large-scale deployment. Lethal management — where legally permitted — is the only method that achieves measurable population reduction. Critically, feral pigeons are morphologically similar to several protected native dove and pigeon species in many jurisdictions, making positive species identification before any lethal action a legal and ethical requirement.

Native range: Europe and western Asia
Invasive range: Americas, Australasia, sub-Saharan Africa, Pacific islands
Why it succeeds: Closely associated with human settlement; exploits grain agriculture; highly competitive for nesting sites
Primary harms: Grain crop damage, displacement of native cavity-nesting birds, disease transmission

Native range: Europe and western Asia
Invasive range: North America, Australasia, South America (Argentina, Uruguay, southern Brazil), South Africa
Why it succeeds: Highly gregarious (flocks of millions); aggressive cavity nester; generalist feeder
Primary harms: Crop damage (fruit, grain, livestock feed), displacement of native cavity nesters, disease transmission, aviation risk

Native range: South Asia — Afghanistan, Pakistan, India, Nepal, Bangladesh, Sri Lanka, Myanmar
Invasive range: Australasia, Pacific islands, East Africa, Middle East, Southeast Asia, Europe (Canary Islands, Azores)
Global population estimate: Unknown; among the most abundant birds in its invasive range
IUCN status: Listed among the 100 World's Worst Invasive Alien Species

Biology and Identification

The common myna (also spelled "mynah" or "Indian myna") is a medium-sized starling-family bird native to South Asia. It was widely introduced across the globe during the 18th–20th centuries, primarily as a biological control agent for agricultural pests — an introduction strategy that proved catastrophically counterproductive.

Identification:

• Body length: 23–26 cm; weight: 82–143 g
• Brown body with black head, bright yellow bill, yellow eye patch (bare skin) and yellow legs — the yellow facial markings are diagnostic
• White wing patches highly visible in flight
• Upright, confident posture; walks rather than hops
• Loud, varied calls including harsh chattering, whistles and mimicry of other species
• Often confused with the Common Starling (Sturnus vulgaris) in flight, and with the Jungle Myna (Acridotheres fuscus) and Bank Myna (Acridotheres ginginianus) at rest — species identification is critical in management contexts

Reproductive Biology

Common mynas are monogamous and highly territorial. They nest in cavities — tree hollows, building crevices, roof spaces, pipes and nest boxes — and will aggressively evict native cavity-nesting species, including parrots, owls, treecreepers and gliders. Breeding season varies by region (spring–summer in temperate zones; year-round in tropical areas). Clutch size is 4–6 eggs; incubation 13–14 days; fledging at 22–24 days. Pairs typically raise 2–3 broods per season.

A key ecological threat is the myna's ability to monopolise cavity nesting resources. In Australia, studies have documented mynas evicting hollow-dependent species including rosellas, galahs, sugar gliders and microbats from nest sites they have used for years.

Why It Succeeds

The common myna is one of the most behaviourally flexible birds in the world. Key traits driving its invasive success:

• Dietary generalism: Omnivorous — insects, fruit, seeds, food scraps, carrion, eggs and nestlings of other species
• Urban adaptation: Thrives in human-modified environments; exploits buildings, parks, gardens and agricultural land
• Aggressive territoriality: Actively defends territory year-round, not just during breeding; will mob and evict much larger species
• Pair bonding: Strong, long-term pair bonds increase breeding success and territorial defence effectiveness
• Intelligence and learning: Rapid adaptation to new food sources and deterrent methods; capable of problem-solving

Ecological Impact

The common myna's impact on native biodiversity is well-documented and severe:

In Pacific island ecosystems — where native birds evolved without aggressive competitors — the impact is particularly severe. On several islands, myna introduction has been directly linked to the decline or local extinction of endemic species.

Economic and Public Health Impact

Management Considerations

Common myna management is most effective when sustained over multiple seasons. Lethal control is the only method that achieves meaningful population reduction. Trapping programs (using myna traps baited with food) are widely used by community groups in Australia and New Zealand, but require significant volunteer effort and ongoing commitment to maintain impact. Habitat modification — removing food sources, sealing building cavities — reduces carrying capacity but does not eliminate established populations.

The myna's similarity to native starling-family species in some regions, and the presence of protected myna species in parts of its native range, makes positive species identification before lethal action an absolute requirement in any compliant management program.

Native range: Sub-Saharan Africa and South Asia
Invasive range: Europe (UK, Belgium, Netherlands, France, Spain, Germany), Middle East, North Africa, Indian Ocean islands, USA (Hawaii; localised California)
Why it succeeds: Cold-tolerant; exploits urban green spaces; large cavity nesting requirements displace native species
Primary harms: Fruit and grain crop damage, displacement of native cavity-nesting birds, noise and roosting nuisance

The global distribution of these species has important implications for pest management programs:

Species identification is non-negotiable. In most jurisdictions, lethal management of birds requires positive species identification before any action is taken. The presence of multiple similar-looking species — native and introduced — in the same environment makes AI-powered species identification a critical safeguard, not a luxury.

Management must be sustained. Pest bird populations are highly resilient. A single season of management followed by cessation allows rapid population rebound. Effective programs require long-term commitment and consistent pressure.

Regulatory requirements vary by jurisdiction. Pest status, permit requirements and approved management methods differ significantly between countries and even between states or provinces within countries. Operators must understand the specific regulatory framework that applies to their location and target species.

Documentation is increasingly required. Government biosecurity agencies and conservation funders increasingly require detailed records of management activity — species identified, methods used, outcomes achieved. Automated systems that generate tamper-proof audit trails are becoming the standard for compliant programs.

• IUCN SSC Invasive Species Specialist Group: iucngisd.org
• USDA Wildlife Services: aphis.usda.gov/wildlife-damage
• Biosecurity New Zealand (MPI): mpi.govt.nz/biosecurity
• Australian DAFF Biosecurity: agriculture.gov.au/biosecurity
• European Commission IAS Regulation: ec.europa.eu/environment/nature/invasivealien
• FAO — Bird Pest Management in Africa: fao.org/pest-management

This reference guide is updated periodically as new species assessments are published by government biosecurity agencies and conservation authorities. If you are aware of a confirmed pest species listing that should be included, contact our team.