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How do you prevent birds from roosting on the roof and possibly preying on bats?
Should this be a problem there are many anti-bird perching devices that could be attached to the roof to deter this. Seach for "bird spikes" on Amazon to start. If a nest forms, knock it down while it's still in the building stage. If you get a large number of bats, birds of prey will eventually notice and may arrive for the emergence and perch anywhere nearby within sight of the bat house. This is common at very large colonies across the southern US. The number of bats natural predators such as snakes and raptors tke will not cause a colony collapse. However, we want to be careful not to give the predators an unfair advantage.