Although the Taiwan Strait is only 130 kilometers wide at its narrowest point, birds which were poor flyers and non-migratory just had to do their best to adapt to the island's topography, climate, vegetation and natural predators.
台灣海峽最狹窄部分雖然只有一百卅公里，但對飛翔能力低、沒有移棲性的鳥類，只有「認命」地適應島上的特殊地形、氣候、植被、天敵……，長時間後遂演進成為特有種或特有亞種。