HKBWS Chuan

Document from HKIA said that they use means including "habitat management, environmental hygiene" and "bird distress calls and ultrasonic repellers".
They have an officer equipped with rifles and he was on a TV programme some years ago.
http://www.hongkongairport.com/e ... eld_and_Systems.pdf

HKBWS could try to raise this concern, would members (if possible) please take photographs when you visit Shenzhen Airport.