By day they fly over the sea to catch fish, returning to shore at dusk. They usually fly no more than 20 km. from shore, so mariners rejoice when they see flocks of terns or gulls at sea because land cannot be far off.
它們白天飛到海上捕魚，晚上便回到岸上，最遠不會飛離海岸廿公里，因此水手們在清晨或傍晚看到海上成群的燕鷗或海鷗，往往心中大喜﹘﹘因為陸地已不遠了。