Anti-roosting spikes might look inhumane, but they’re one of the most effective ways to protect your balcony. They’re not sharp, so you won’t damage the birds.
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Pigeons are almost universally considered vermin. Pest control is an expensive way to deal with the problem, as they’ll just dispose of the eggs too.
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The easiest way to keep pigeons off a balcony is to set up netting between the railing and roof. It isn't particularly attractive but it gets the job done.
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There are plenty of humane ways to keep pigeons off your balcony. They basically all boil down to making it inconvenient or unpleasant.
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