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托福听力练习-科学美国人60秒:斑点鬣狗笑声

2017-08-01 09:43:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：斑点鬣狗笑声

　　科学美国人60秒听力练习：斑点鬣狗笑声

　　科学美国人60秒英文文本

　　Hyena Laughter Is Serious Business

　　Spotted hyenas grunt and growl. But you know what they're famous for. [Hyena sounds.] So what's all the laughing about?

　　Well, field researchers have noticed that groups of hyenas tend to giggle around a kill, while they're waiting for their hunk of meat. Now a study in the journal BMC Ecology [See http://bit.ly/cGTzkn] says the chuckles may communicate things like age, identity and social status. Which is important stuff for figuring out who gets the tastiest cut of zebra.

　　Researchers [Nicolas Mathevon et al.] studied a clan of spotted hyenas living in a sanctuary behind the U.C. Berkeley campus. They enticed 17 hungry hyenas with bones or pieces of meat, and recorded about 250 bouts of giggling. Then they ran those sound bites through various computer algorithms, running statistical analyses and drawing up spectrograms.

　　The result? They say a giggle's pitch and timbre establish a hyena's identity, and that pitch indicates age. But the giggle also tells you who's boss. A relatively monotone giggle [hyena sound] and you're first to the meat. A more erratic, variable giggle? [Hyena sound] Get back in line.

　　The researchers next plan to study hyenas in the wild. Just for laughs.

　　—Christopher Intagliata

　　[The above text is an exact transcript of this podcast, which is not an April Fool's joke, despite all the giggling.]

　　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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