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The birds will be frightened and not to come back. Our lasers are using in many countries for farmers protecting their lands and scientists working in forests. Spartan 637nm 90mW Red Laser Pointer Control birds from 100m to 1km. This laser has a very bright red beam and very low divergence. The beam is still concentrated and bright enough to scare birds from long distance. Spartan 532nm 100mW to 300mW Green Laser Pointer control birds from 100m to 1km.
The only bird known to make use of infrasound (at about 20 Hz) is the western capercaillie. The hearing range of birds is from below 50 Hz (infrasound) to around 12 kHz, with maximum sensitivity between 1 and 5 kHz. The range of frequencies at which birds call in an environment varies with the quality of habitat and the ambient sounds.