《汉书·志·五行志中之下》
鹳鹄之羽白色，是旱情的祥异；穴居而喜欢在水中游弋，水为黑色，这是君主危急的象征。
雊鹆白羽，旱之祥也；穴居而好水，黑色，为主急之应也。
The feathers of the stork hoopoe are white, an ominous symbol of drought; they dig holes and like to swim in water, and the water is black, a symbol of the sovereign’s peril.