High-powered directional speakers can be used to repel flocks of birds.

The bird repellent system for aircraft and the bird collision prevention system for wind turbines are the same.

Birds can be classified into migratory birds and resident birds based on their residence patterns in the area.

Birds that flee in response to the speaker are mainly migratory birds,

while resident birds do not respond well.

Various sound sources must be used, and they are sensitive to intermittent sounds (e.g., gunshots).