The largest , showiest , and most bizarre orchids occur in the tropics .

最大最耀眼最奇异的兰花生长在热带.

This is the idea - and it remained controversial until recently - that males in many species are burdened with showy ornaments like enormous tails because the females of their species have , by repeatedly picking the showiest males as their mates , caused them to evolve them that way .

性选择理论（直到最近依然备受争议）认为：许多物种中雄性背负着巨大华丽的装饰，如巨大的尾巴，是因为它们种类中的雌性通过不断选择它们同类中最炫的雄性作为配偶，从而引致它们按照那种方式演化。