Guide / Drone

The drone equipped with ultrasound, attracting birds and guide them to the right path. With the character of ultrasound that it does not be heard of human, but birds, drone will not cause noise pollution. Besides, it will not influence flight safety, nor have a toll on Nature when guiding the lost transients.
For the nature
Due to electromagnetic wave, Some transients would lose when they migrate nowadays. "Guide"can lead the lost transients to the right path.
For the flight safety
Airplanes sometimes would get birds attack when they take-off and landing."Guide" can really guide the birds to other areas.