We have a nest of one of these on our property and I am not sure whether they are a nuisance or a helpful part of God’s creation. They are annoying in many ways first their annoying calls. the long whoo-whooo-who in the morning, througout the day and at night, secondly the noise that their wingbeats make in take off. The wind whistles through their wings and makes an extremely annoying whistle. On the other hand they are part of God’s creation and do have a purpose. They eat insects and keep the population down (especially mosquitoes), and their whistling wingbeats during takeoff serve as a signal to other animals of dangers that may be coming and therefore they serve as a early warning system.