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托福听力练习-科学美国人60秒:城市里的鸟

2017-05-06 09:11:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：城市里的鸟

　　科学美国人60秒听力练习：城市里的鸟

　　科学美国人60秒英文文本

　　Cities have a lot to offer: theater, music, restaurants, birds. Yes, birds. But city birds are not like otherbirds. Because big cities are inhabited by birds withbig brains. That’s according to a study in the journalBiology Letters. [Alexei Maklakov et al., "Brains andthe city: big-brained passerine birds succeed inurban environments"]

　　It can take smarts to survive in the big city. Especially for birds. The urban environment isvery different from the one in which their ancestors were born and fledged. But do city birdsreally need more gray matter to make it?

　　Scientists surveyed 82 species of passerine birds, including sparrows and anything thatperches, in and around 12 cities in central Europe.* They classified the birds as those thatbreed in the heart of the city or those that avoid the hustle and bustle. And then theycompared the bird brains.

　　The results? Birds that prosper on the city streets have larger brains than their pastoralrelations. So it seems that novel environments, including urban landscapes, may select forstreet smarts—at least for birds that flock toward the city lights.

　　Urban areas continue to spread. So to survive, our feathered friends may need to expandtheir minds as they spread their wings.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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