Which nuisance birds are legal to control in Ontario?

European starlings, house sparrows, and rock pigeons are non-native, introduced species and are not protected under Canada's Migratory Birds Convention Act, so humane exclusion and removal are permitted. Almost all native birds — including Canada geese and their nests and eggs — ARE protected, and interfering with them requires a federal permit. Always confirm the species before acting.

Why are birds in my dryer or bathroom vent a fire hazard?

Starlings and house sparrows love the warm, sheltered cavity behind an exterior vent. Their dry grass-and-twig nests block airflow, which makes a dryer overheat and can ignite lint — a documented cause of house fires. A blocked bathroom or range vent also traps moisture and fumes. Vent nests should be removed and the vents fitted with proper guarded covers.

Can I remove a Canada goose nest from my property?

Not without authorization. Canada geese, their nests, and their eggs are protected under the Migratory Birds Convention Act, and disturbing them requires a permit from Environment and Climate Change Canada. The legal approach is prevention — deterrents and habitat changes before nesting begins — plus permitted management for established problems on commercial sites.

Are starling and sparrow droppings dangerous?

Where droppings accumulate, dried material can carry the fungal spores behind histoplasmosis, and large communal roosts amplify that risk. Nests also bring in mites and other parasites that can move indoors. For most homeowners the exposure is small; the real concern is at commercial sites, food premises, and anywhere large accumulations must be cleaned — using wet methods and PPE.

How do I keep birds out of vents, signs, and rooflines?

Exclusion. Fit guarded vent covers over dryer and bathroom vents, screen soffit and gable openings, net or spike ledges and signage, and seal gaps into attics and wall voids. Do the work outside active nesting for unprotected species, and confirm no protected bird is nesting first. Removing food and water sources reduces the draw across every species.

Nuisance Birds in Ontario: Control Guide

Overview

Beyond pigeons, three birds cause most of Ontario’s nuisance-bird calls: the European starling and house sparrow, which cram nests into vents, soffits, and signage, and the Canada goose, which fouls lawns, parks, and commercial grounds. The legal picture matters before you touch anything — starlings, sparrows, and pigeons are non-native and unprotected, while geese and virtually all native birds are federally protected. Get the species right, and nuisance-bird control becomes a straightforward exercise in exclusion and prevention.

Identification

House sparrows are small (about 15 cm), chunky, brown-and-grey birds; males have a black bib and chestnut nape. European starlings (about 21 cm) are glossy black with green-purple iridescence and pale speckling in winter, and a yellow bill in breeding season. Canada geese are unmistakable — large grey-brown waterbirds around a metre long with a black neck and white chinstrap.

Species	Size	Key ID	Protected in Canada?
House sparrow	~15 cm	Brown; male black bib	No
European starling	~21 cm	Glossy, speckled; yellow bill	No
Rock pigeon	30–37 cm	Grey, stocky	No
Canada goose	~1 m	Black neck, white chinstrap	Yes
Most native songbirds	varies	—	Yes

The unprotected trio is what most vent and signage problems come down to; anything else nesting on your property should be assumed protected until identified. Our pigeon guide covers rock pigeons in detail.

Life Cycle

Starlings and house sparrows are prolific cavity nesters that raise two to three broods a season, often reusing the same vent or void year after year and beginning early in spring. Canada geese pair in spring, nest on the ground near water, and lead goslings to grazing areas through summer; they’re strongly loyal to successful nesting sites and return annually. The shared theme is site fidelity — an unaddressed nesting location becomes a recurring, worsening problem each year.

Habitat & Behaviour

Starlings and sparrows exploit the built environment: dryer and bathroom vents, gable and soffit vents, signage cavities, roof edges, and warehouse and barn structures. They form large, noisy communal roosts, especially in cooler months. Canada geese favour open, mown grass beside water — exactly the landscaping of corporate campuses, parks, stormwater ponds, and condominium grounds — where short grass gives them sightlines and easy grazing. All are bold around people and quick to habituate to scare tactics.

Diet

House sparrows and starlings are omnivores, eating seeds, grain, insects, fruit, and human food scraps, which ties them to spilled birdseed, garbage, and outdoor dining. Canada geese graze on grass, shoots, and grain and are drawn to fertilized, irrigated turf beside water. In every case, an available food source is a primary anchor, so reducing feeding and spillage is foundational to control.

Signs of Infestation

Nesting material protruding from a vent, soffit, or sign, with birds coming and going.
Chirping or scratching behind walls, vents, or ceilings during nesting season.
Droppings and feathers accumulating under roost lines, on signage, and on walkways.
Goose droppings blanketing lawns and paths near water, with grazing flocks present.
A dryer running hot or slow — a classic sign of a bird nest blocking the vent.

Damage Caused

Vent nests block airflow and create a genuine fire hazard in dryer ducts, while trapping moisture behind bathroom and range vents. Nests in soffits and walls bring in parasites and staining, and clogged gutters back up. Droppings corrode and foul building surfaces, vehicles, and signage. Canada geese damage turf through overgrazing and heavy fouling, making commercial lawns, parks, and pond edges unusable and creating slip and hygiene issues. For commercial properties, the combined maintenance, liability, and image costs are significant.

Health Risks

Accumulated droppings from starlings, sparrows, and communal roosts can carry the fungal spores behind histoplasmosis when disturbed dry, and nests introduce bird mites and other ectoparasites that occasionally enter living spaces. Goose droppings foul recreational areas and can contribute bacteria to stormwater. As with pigeons, everyday passersby face low risk; the meaningful exposure is during cleanup of accumulations, which should use wet methods and PPE — a routine consideration on commercial and food-service sites.

Seasonal Activity in Ontario

Starlings and house sparrows are present and nesting-capable year-round, with peak nesting from spring into summer and large roosts forming in fall and winter. Canada geese are most problematic spring through fall — nesting in spring, raising goslings and moulting (flightless) through early summer, and grazing in flocks into autumn before many populations move on, though some overwinter where water stays open. Timing exclusion around these windows — and around the legal protection of nesting geese — is essential.

Where They Hide

Starlings and sparrows: dryer/bathroom/range vents, gable and soffit vents, signage cavities, roof edges, warehouse rafters, and barn structures. Geese don’t hide — they occupy open turf beside water and nest on the ground near ponds, islands, and landscaped shorelines.

How They Enter Homes & Buildings

Starlings and sparrows enter through unguarded exterior vents, broken vent flaps, open soffit and gable vents, and gaps at the roofline into attics and wall voids. Geese are an outdoor-grounds problem rather than a structural-entry one — the “entry” is simply attractive open lawn beside water.

Prevention Tips

Fit guarded, flapped covers on every dryer, bathroom, and range vent — the single most important step for fire safety.
Screen soffit, gable, and attic vents to block cavity nesting.
Net or spike ledges, signage, and rooflines where birds perch and nest.
Remove food and water draws — secure garbage, clean spilled seed, stop feeding.
For geese, let shoreline grass grow tall, add plantings or barriers at the water’s edge, and reduce open mown turf near water.
Do exclusion outside active nesting for unprotected species — and confirm no protected bird is nesting first.
Clean fouled areas (wet methods, PPE) before installing deterrents.

DIY vs. Professional Treatment

Swapping a vent cover you can reach is a reasonable homeowner job — but the moment a nest is deep in a soffit, a sign, or a run of commercial rooflines, or the moment geese are established on a property, professional help is the right call for both effectiveness and legality. The legal line is the critical part: acting against a protected species or its nest without a permit is an offence, so correct identification comes first, every time. Sani IQ identifies the species, confirms what’s permitted, installs complete exclusion for the unprotected birds, and — for protected species like geese — advises on lawful, permitted management and prevention rather than anything that would break federal law. For commercial grounds and buildings we build a full bird-management program; for homes, our residential and wildlife team closes the vents and rooflines, backed by our Pest-Free-Or-It’s-Free guarantee.

References

Last updated: July 16, 2026 · Reviewed by Sani IQ licensed technicians

Nuisance Birds in Ontario