Huang Kuang-ying explains that the reproductive rate of predators in the food chain is usually low. For example, the crested serpent eagle produces only one or two eggs each year virtually without exception.
黃光瀛解釋，食物鍊中的掠食者，繁殖率往往比較低，例如台灣的大冠鷲幾乎一年只生一、二個蛋。