科学美国人60秒:色彩斑斓的鸟-托福听力下载

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　　科学美国人60秒中英文翻译：色彩斑斓的鸟

　　科学美国人60秒英文文本

　　When you think of birds, you probably imagine their dazzling plumage or their beautiful songs.

　　But since the days of Darwin, scientists have figured that individual species of birds should not have both:

　　they’d either be drab virtuosos or eye candy that sings only one note.

　　Now a study shows that some songbirds are in fact show-offs in sight and sound.

　　The work is in the Proceedings of the Royal Society B.

　　物种选择.jpg

　　Bright feathers and complex songs are different ways to attract a mate.

　　The more flamboyant the display, the more likely a bird will get noticed.

　　But these exaggerated calling cards take a lot of energy to produce.

　　Which is why scientists assumed that birds would have to choose between melody or looks.

　　But an exhaustive survey of the tanagers, a family of songbirds from Central and South America, shows no sign of a tradeoff.

　　Although some tanager species do emphasize oration over attire, like the aptly named drab hemispingus.

　　Some, like the mountain tanager, are both dashing and melodious.

　　While the white-bellied seedeater is fine with looking and sounding rather dull.

　　The different species likely experienced different selective pressures, leading to their varied strategies.

　　Whatever it takes to catch the eye, and or ear, of a potential mate.

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