https://ling-lingchinese.com/2015/02/14/a-chinese-joke-%e4%b8%ad%e5%9b%bd%e7%ac%91%e8%af%9d%ef%bc%9athree-kinds-of-stupid-birds-%e4%b8%89%e7%a7%8d%e7%ac%a8%e9%b8%9f%ef%bc%89/