The house sparrow is a small, stocky bird of about 13 cm to 16 cm, with a thick conical bill built for seeds. The male has a grey crown, chestnut brown along the sides and back of the neck, white cheeks and a black bib on the throat and chest that widens as the bird matures. The female and juveniles are plainer, in streaked dull brown and buff with a pale stripe behind the eye and no bib. Both have short legs and a short square tail. They are noisy, sociable and confident around people, hopping rather than walking, and gathering in chattering groups in hedges, on signage and around patios. The call is a flat repeated chirp.
They favour the same gaps every year, so an unaddressed site is reused each spring.
The house sparrow was introduced to North America in the nineteenth century and has lived alongside people ever since. It is not a woodland bird. It is a building bird, and it nests in cavities, which in a city means vents, soffit gaps, signage boxes, light fixtures, open rafters and the space behind loose flashing. Food is easy to come by: seed from bird feeders, spilled grain, crumbs around patios and food courts, pet food, and waste around bins. Warehouses, garden centres, grocery stores, farms and restaurant patios across the GTA, Ottawa and Hamilton give them everything they need. They stay all winter rather than migrating, so a nesting site near shelter and food supports birds year round.
They are not a danger to people in any direct sense. They do not attack, and healthy adults are not at risk from having sparrows on the property. The problems are practical. Nests packed into dryer vents, exhaust ducts and light fittings block airflow and create a fire risk, and the dry material is flammable. Droppings soil entrances, stock, vehicles and outdoor seating, and they are corrosive over time. Nest debris carries mites, carpet beetles and flies that can move into the building. In food handling and retail settings, birds inside the building are a hygiene issue and can affect inspections. House sparrows also compete aggressively with native cavity nesting birds, which is one reason they are treated differently from protected native species.
Closing the cavity is the step that lasts. Everything else is maintenance.
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The house sparrow is an introduced species and is not covered by the federal migratory bird protections that apply to most native birds. Other rules can still apply, so we work within them and do not offer legal advice.
It is a warm, sheltered cavity with an opening they can fit through, which is exactly what they look for. A well fitted vent guard prevents it without affecting airflow.
You can clear an inactive nest, but unless the opening is closed the birds rebuild within days. Correct identification also matters, because native species are handled differently.
The birds themselves are not a direct danger. The concern is nest debris and droppings, which can carry mites and other insects and should be cleaned up properly.
No. House sparrows do not migrate. They stay near buildings all year, which is why exclusion rather than waiting is the practical answer.
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Other pests we deal with that often turn up in the same places.
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