综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

  >Home>News Center>China
       
 

Rare Chinese frog uses ultrasonic communication
(Rueters)
Updated: 2006-03-16 08:43

Bats, whales and dolphins use it to communicate. Baby rodents call their mothers with it and now a rare Chinese frog has shown it can hear and respond to ultrasounds, scientists said on Wednesday.

The frog, Amolops tormotus, is the first non-mammalian species known to use the ultra-high frequencies that humans cannot hear.

It comes in handy to be heard above the pounding waterfalls and streams in the mountainous region of east-central China where Amolops tormotus, which is known as the concave-eared torrent frog, lives.

"Nature has a way of evolving mechanisms to facilitate communication in very adverse situations," said Professor Albert Feng of the University of Illinois at Urbana-Champaign.

"One way is to shift the frequencies beyond the spectrum of the background noise. Mammals such as bats, whales and dolphins do this, and use ultrasound for their sonar system and communication."

But until now it was not known that some frogs were able to use ultrasound.

Kraig Adler, a biologist at Cornell University in New York, first noticed the frog with no external eardrums while surveying amphibians in China. He told Feng, an auditory neuroscientist who studies frogs and bats, about his find.

Feng and his colleagues conducted tests on the frogs to determine whether they could hear and respond to ultrasounds.

"Now we are getting a better understanding of why their ear drums are recessed," said Feng, who reported his findings in the journal Nature.

"Thin eardrums are needed for detection of ultrasound. Recessed ears shorten the path between eardrums and the ear, enabling the transmission to the ears," he added in a statement.

Ultrasounds are high-pitched sounds of more than 20 kilohertz (kHz) frequency -- much higher than the frequency most birds, reptiles and amphibians can hear.



Tallest woman in Asia
Volunteer: Learn to protect our environment
China marks World Consumer Rights Day
  Today's Top News     Top China News
 

US senators to visit China to talk trade issues

 

   
 

Consumption seen as new driver of growth

 

   
 

General aviation sector to scale new heights

 

   
 

Stringent checks on products assured

 

   
 

China sets minimum age for TV contestants

 

   
 

Saddam urges Iraqis to unite against US

 

   
  Toll hits 21 in N. China coal mine blast
   
  Rolls-Royce wins follow-on China order
   
  Wen: We're watching secessionists moves
   
  Plagiarism, fake research plague academia
   
  China sets minimum age for TV contestants
   
  Communication channel with Dalai Lama open
   
 
  Go to Another Section  
 
 
  Story Tools  
   
Manufacturers, Exporters, Wholesalers - Global trade starts here.
Advertisement
         
芦山县| 叶城县| 孟连| 沙河市| 宁安市| 伊春市| 开远市| 凤山县| 渝北区| 苏州市| 玉溪市| 锦州市| 莆田市| 罗田县| 安龙县| 洛南县| 淅川县| 平邑县| 余江县| 宣汉县| 弋阳县| 德庆县| 莒南县| 恭城| 龙门县| 鹤壁市| 江源县| 潮安县| 东城区| 镇坪县| 拜泉县| 永顺县| 昌宁县| 金平| 长岛县| 新乡市| 宜城市| 鲁山县| 铁岭市| 车致| 五华县|