在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

  >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
         
主站蜘蛛池模板: 国产www视频 | 国产日韩欧美一区二区 | 亚洲高清在线观看 | 国产一区二区中文字幕 | 高清一区二区三区 | 久久色av | 高清免费av | 高潮毛片又色又爽免费 | 草逼视频网站 | 中文字幕日本 | 久久国语 | 99视频网站 | 日韩欧美一区二区三区四区 | 久久久久久中文字幕 | 亚洲成人福利 | 国产精品视频网站 | 久操精品视频 | 天天干天天操天天插 | 一区二区在线看 | 中文字幕在线观看免费 | 免费在线观看毛片 | 国产精品偷拍 | 久久机热 | 国产一级免费 | 国产二区精品 | 久久日韩精品 | 18岁毛片 | 五月综合激情网 | 在线一区视频 | h在线视频 | 一区二区视频在线播放 | 免费视频国产 | 亚洲五码在线 | 9999精品视频| 日韩精品一区在线观看 | 一级片免费视频 | 亚洲一区欧美 | 精品一二三区 | 成人三级视频在线观看 | 中文字幕在线免费看 | 在线观看黄色小视频 |