Guano, feathers and roost behaviour
White-and-grey guano on ledges, parapets and pavements below. Pigeons returning to the same ledge at the same times each day.
Guano accumulating on a ledge or pavement, plus repeated cooing from the same point morning and evening, is the everyday opener.
Confidence rule — Once a roost is visibly used (guano, feathers, twigs) the flock will return year after year unless every perch is proofed.
White-and-grey guano on ledges, parapets and pavements below. Pigeons returning to the same ledge at the same times each day.
Persistent cooing from the same point at dawn and dusk. Wing-clap as a flock leaves a roof — a distinctive percussive sound.
Concentrated guano produces a sharp ammonia smell, particularly in enclosed loft voids or behind signage. Decomposing chicks add to this in spring.
Blocked gutters and downpipes — almost always nest material, not leaves. Pitted lead flashing and stained stonework from acidic guano.
Flat ledges above 2m, parapet copings, the void above shop signage, behind solar panels and on any pitched-roof junction with a flat landing.
Time of activity is one of the fastest ways to confirm a species — daytime loft noise rules out rats, midnight kitchen scuttling rules out squirrels.
Guano on a customer-facing pavement, or a roost on a flat above a food business — both create statutory nuisance and health-and-safety obligations.
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