At Hong Kong's Chep Lap Kok International Airport, for example, there is a one-kilometer wide channel between the airport and Lantau Island that was frequented by humpback dolphins prior to construction of the airport, but since land reclamation was carried out to make space for the airport, researchers have not spotted a single dolphin there in nearly 100 trips to the area.
以赤蠟角機場為例，機場和大嶼山之間有條一公里寬的水道，機場建造前，那裡曾是白海豚往返洄游之處，填海後，研究人員橫越這條水道近百次，卻再也沒有目擊到海豚。