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 .
