This utility app is created as a virtual scarecrow to help you get rid of noisy birds in your area. This works by mimicking the sounds of their predators, which alerts them by instinct and puts them on an auto flight/fight mode.
It features recorded calls, cries and howls of 6 predatory birds, namely:
Hawk
Owl
Falcon
Osprey
Eagle
Kite
Simply Open the App > Choose a Predator > Hit Play!
You may choose to have it play noises Continuously, Once, or on a set Intervals.
(Also, make sure to raise the volume of you device to maximize the effects)