Birdsong and the city

鳥兒為城市改變歌聲(圖)

Faced with traffic noise and other human-made din, city birds have taken matters into their own hands: They adjust their songs in real time to make themselves heard. Researchers exposed 21 finches to a spectrum of ambient noise recorded on a busy Mexico City street. The finches shifted the frequency of their songs higher as their surroundings grew louder, showing the birds change their songs as needed to beat the noise.

面對(duì)著城市的交通噪音和喧鬧嘈雜，為了讓自己的歌聲被聽到，鳥兒也有自己的看家本領(lǐng)：實(shí)時(shí)調(diào)整歌聲。研究人員在在繁忙的墨西哥城街道錄下了一系列不同頻率的環(huán)境噪音，讓21只鳥雀置身其中。結(jié)果發(fā)現(xiàn)周圍噪音越響，鳥鳴聲的頻率也越高。這表明鳥兒為了"打敗"噪聲，在隨時(shí)調(diào)整著自己的歌聲。

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