Bird control is almost entirely exclusion and deterrence — netting, spikes, and sealing off roosting and nesting spots — rather than removal, since many common nuisance species (and their active nests) are protected under the federal Migratory Bird Treaty Act and can't legally be disturbed once nesting has started.
Beyond the nuisance of droppings and noise, accumulated droppings can damage roofing and siding over time and carry their own health risks, which is why prevention before nesting starts is the more effective approach than removal after the fact.
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