Only 200 of the birds are left worldwide, and when their overwintering place at the mouth of the Tsengwen River was designated by the Tainan County government as the proposed site for developing the Chiku Industrial Zone, people discovered that they could not find another natural area of tidal land on which the birds might settle.
「一句話，沙洲越來越消退」，在此地發現名噪一時的黑面琵鷺的資深鳥友郭忠誠說。全世界僅存二百多隻的黑面琵鷺，在曾文溪口的棲息地，被縣府劃為七股工業區預定地後，人們卻發現，無法在當地另為它們找到一塊天然海埔地落腳。