Charles Darwin, by contrast, found a lead for his theory of natural selection in the whimsical hobby of pigeon fancying, where the birds showed an enormous variety of form and behaviour.

• 达尔文则相反，他最初就是在放鸽子运动中通过一些特殊的习性发现了自然选择理论(鸽子奇特习性)，它们在行为方式上表现出巨大的变化。