"Asia-Pacific transportation hub" for birds "When filming a nature documentary, there are many special conditions and requirements. The most important of these is that the filmmaker have complete research information to use as a foundation," says King Hen-biau, who produced Liu's migratory bird documentary "Taiwan Terns." This prerequisite limits the number of wildlife species which can be incorporated into the film script.
「拍攝野生動物的紀實影片，有許多特殊的條件與要求，最重要的就是，對拍攝的對象要有研究完成的資料可作依據」，《燕鷗》的執行製片金恆鑣說，而這個條件就限制了能入劇本的野生動物種類。