Repellent

Pyrotechnics


Pyrotechnics are used daily by airports all over the world to drive birds away. Flashbangs and screamers make loud noises, others emit whistling sounds, while some emit sparks. A banger shot from a pistol cartridge can travel 30-40 yards before exploding, while a 12-gauge shotgun can reach 70-100 yards. Waterfowl respond fairly well and relocate after a few times pyrotechnics are used. However, raptors can be harder to move. Birds can also become habituated to the use of pyrotechnics.

Predators


Falcons are trained to fly over roosting areas near airports to disrupt birds before they nest, and dogs like border collies are trained to chase birds away, thus teaching the birds that the area has many natural predators.

Technology


Bioacoustics, like the playing of predator calls or bird distress calls through sound systems are an effective way of dispersing birds near airports, because they rely on the birds' evolutionary danger response. Sonic cannons have also been used to disrupt birds. Lasers have also been used at dawn and dusk to simulate predators and scare birds away. However, such bioacoustics and lasers are species specific, and different sounds and wavelengths of lasers work on different types of birds. Over time, birds can also become adapted and habituated to such sound or light systems and return to the area.
Chemical repellents like tactile repellents and bird aversion agents can cause birds to experience unpleasant and irritating sensations when they land or feed near the airports, thus deterring them from coming near the vicinity of the airport.
Technology to track birds like radars have also been employed to detect birds and alter flight paths according to their location, but such technology is still in its infancy.