How do you prevent "doves" from migrating in your rooftop?

Answers:
Any humane pest control company should be able to install a wire mesh over areas they can get into or on top of. It's uncomfortable for them to roost in or land on. A slinky-like material can also be stretched across edges, ledges, etc. that accomplishes the same thing.

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place an owl decoy up there, that will do the trick.

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I have an owl and that does not work you might put up wind chimes that might scare them away. Are you against Doves? Just wondering...