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Mice appear to woo mates in song	老鼠用“歌聲”來吸引異性
Scientists have known for decades that male lab mice produce high-frequency sounds when they pick up the scent of a female mouse, but it turns out those sounds are more complex and interesting than previously thought. Songbirds may be the Sinatras of the animal world, but male mice can carry a tune too, say Washington University researchers who were surprised by what they heard. Scientists have known for decades that male lab mice produce high-frequency sounds - undetectable by human ears - when they pick up the scent of a female mouse. This high-pitched babble is presumably for courtship, although scientists are not certain. But it turns out those sounds are more complex and interesting than previously thought. "It soon became apparent that these vocalizations were not random twitterings but songs," said researcher Timothy Holy. "There was a pattern to them. They sounded a lot like bird songs." To make their point, the researchers provided audio recordings of the sounds, which have been modified for human ears. The recordings do indeed sound birdlike. The findings by the researchers at Washington University School of Medicine in St. Louis are published online Tuesday in the journal Public Library of Science Biology. If the analysis by the researchers is confirmed, mice can be added to the short list of creatures that sing in the presence of the opposite sex, including songbirds, humpback whales, porpoises, insects and, possibly, bats. "There was joy in this discovery," Holy said. "We didn't expect it." The finding opens the possibility of using mice to study and develop treatments for autism and other communication disorders, said Holy, the lead author and assistant professor of neurobiology and anatomy at the university's medical school. Bird song is used to understand how the human brain works. But some questions might be posed better with mice, for experimental convenience, he said. If it is true that the male mice are producing songs, it raises questions about how their sounds develop and whether mice - like birds - are able to learn new sounds, said animal communication expert Peter Marler, a behavioral neurobiologist at University of California, Davis. (Agencies)	鳴雀也許是動物世界中的法蘭克·辛納屈（能歌能演的全能藝人，曾演唱過多首經典歌曲），然而，雄性老鼠同樣可以發出“曲調優美”的聲音。華盛頓大學的研究者們在實驗室中聽到了雄性老鼠有規律的叫聲，這著實讓他們吃了一驚。 幾十年前科學家們就知道，當實驗室中的雄性老鼠聞到雌性老鼠的氣味時，會發出高頻率的聲音，這種聲音人耳通常是無法察覺的。據推測，雄性老鼠發出這種含糊不清的高頻聲音是在求愛，盡管科學家對這一點還不是很確定。 但這種聲音要比以前認識的復雜得多，也有趣得多。 “很快，我們就知道這些發聲法不是雜亂無章的喋喋不休，而是歌聲。它們有固定的形式，聽上去更像鳥兒的歌聲，”研究者蒂莫西·霍利說。 為了證明他們的觀點，研究者們提供了雄性老鼠發出聲音的錄音，經過處理后人耳可以聽得到，這些錄音聽上去確實很像小鳥的聲音。 華盛頓大學圣路易醫學院的研究者們周二把研究結果發表在生物學公共圖書館的網站上。 如果研究者們的分析能夠得到證實，老鼠可以加入會在異性面前“唱歌”的生物之列，這類動物包括鳴雀、座頭鯨、昆蟲，可能還有蝙蝠。 “這個發現很有趣，我們沒有想到這樣的結果。”他說。 這一發現使得用老鼠來做研究，開發治療孤獨癥和其他溝通障礙成為可能，霍利說。他是這個研究報告的主要作者，也是華盛頓大學醫學院神經生物學和解剖學的副教授。 小鳥的歌聲通常被用來了解人腦的工作方式，如果這個發現被證實的話，可以用老鼠來做實驗，這樣會更方便，也會提出更多問題。 如果雄性老鼠真的會“唱歌”的話，那么問題就是它們的聲音是怎么發出來的，還有老鼠是不是也像小鳥一樣能夠學一些新的聲音，動物溝通專家彼得·馬勒說，他是美國加州大學戴維斯分校行為神經生物學家。  (中國日報網站薛曉文編譯)