Population increases and urban expansion have led to the exploitation of marginal lands, while deforestation and the filling of estuaries, swamps, and tidal areas have driven out the birds that originally lived there.
化學毒物使親鳥不孕台灣人口的增加、都市的擴展，使得我們不得不去開發利用一些邊際土地。而森林的砍伐，河口、沼澤、海岸潮汐地帶的圍堤填土，使得原本以這些地區為棲地的鷹鷲鳥類不得不遠走他去。