As for animals that only eat one type of food, that only live on one kind of tree, or whose mobility is low or who require a high degree of concealment, these are often the "first sacrifices" to the development of the environment.
民國七十年至今，台北的「鷹口」數字都掛零。身體五彩斑爛，常被錯認是異國熱帶魚的台灣鬥魚（俗稱三斑），原本廣遊於台灣溝渠。