Scratching in the ceiling during daylight hours is one of the clearest signals in pest work. Mice are nocturnal and light on their feet; if you are hearing activity overhead in the morning and it sounds like something with weight, you are most likely dealing with squirrels or birds. Both are common in Ontario attics, and both come with legal rules that make DIY removal a genuinely bad idea.
How to Tell What Is Up There
The timing and the sound narrow it down quickly.
- Grey and black squirrels are active at dawn and again in late afternoon. You will hear fast scurrying, rolling sounds as they move nuts, and persistent gnawing. They are strong chewers and will enlarge a small gap into a proper entry hole.
- Red squirrels are smaller and noisier for their size, and tend to cache large quantities of material in insulation.
- Birds — most often starlings, house sparrows and chimney swifts — produce chirping, fluttering and rustling concentrated around vents, soffits and chimneys. The noise usually peaks at first light and comes from a fixed spot rather than moving across the ceiling.
- Flying squirrels are nocturnal, which confuses matters, but they are noticeably lighter and more acrobatic than grey squirrels and often glide audibly between joists.
Other evidence worth checking from inside: droppings in the attic, torn or tunnelled insulation, chewed wiring, nesting material packed into corners, and staining or a strong ammonia smell where urine has soaked into insulation.
How They Get In
Squirrels rarely need a pre-existing hole because they will make one. Typical entry points on Ontario homes are roof and gable vents with damaged screening, soffit and fascia junctions, the roof edge where shingles meet the drip edge, chimney chases, plumbing stacks, and any spot where a tree branch gives them a launch point onto the roof.
Birds are more opportunistic and use existing openings: unscreened bathroom and dryer vents, gaps behind loose soffit panels, uncapped chimneys and damaged ridge vents. A dryer vent with a broken flap is one of the most common bird entry points we see.
The Law Matters Here
This is where attic wildlife differs sharply from a mouse problem. In Ontario, wildlife removal is governed by the Fish and Wildlife Conservation Act, and birds are additionally protected federally under the Migratory Birds Convention Act. Together these place real limits on what can be done and when.
The critical issue is dependent young. Squirrels in Ontario typically have two litters a year, in late winter and again in mid to late summer, which means an August attic problem very often involves juveniles that cannot yet leave on their own. Bird nesting season generally runs April through August. Sealing an entry point while young are inside is both inhumane and legally problematic, and it creates a serious secondary problem: trapped animals die in the wall or attic, and you are then dealing with odour, flies and a demolition job to retrieve them.
There are also restrictions on relocation distance and on which species may be handled at all, which is why exclusion work of this kind is done by licensed operators rather than by homeowners.
How Professional Removal Actually Works
Done properly, the sequence is deliberate and the order matters:
- Inspect first to confirm the species, locate every entry point, and determine whether dependent young are present.
- Remove young by hand where they are found, placing them in a heated reunion box positioned so the mother can retrieve and relocate them to a secondary den.
- Install a one-way door over the main opening, which lets adults exit but not re-enter.
- Seal every secondary opening with chew-resistant material — galvanised mesh, sheet metal and proper fasteners rather than foam.
- Confirm the space is empty, then remove the one-way door and close the primary entry permanently.
- Address the aftermath: contaminated insulation, chewed wiring and nesting debris, which is often the costlier half of the job.
The step homeowners most often get wrong is sealing the hole as soon as they find it. If anything is inside — and in summer something usually is — that converts a straightforward eviction into a much worse problem.
Hearing Something in Your Attic?
Husky’s licensed technicians identify the species, check for dependent young, and handle humane removal and exclusion in line with Ontario regulations. Same-day service available across Ontario.
Related Husky services: Wildlife Removal for humane squirrel, bird and raccoon exclusion, Rodent Control if the noise turns out to be mice instead, and Property Management Pest Control for multi-unit and commercial roofs. Also worth reading: what Ontario law says about raccoons in your attic.