• <nav id="c8c2c"></nav>
      • <tfoot id="c8c2c"><noscript id="c8c2c"></noscript></tfoot>
      • <tfoot id="c8c2c"><noscript id="c8c2c"></noscript></tfoot>
      • <nav id="c8c2c"><sup id="c8c2c"></sup></nav>
        <tr id="c8c2c"></tr>
      • a级毛片av无码,久久精品人人爽人人爽,国产r级在线播放,国产在线高清一区二区

          >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
                 
        a级毛片av无码
        • <nav id="c8c2c"></nav>
          • <tfoot id="c8c2c"><noscript id="c8c2c"></noscript></tfoot>
          • <tfoot id="c8c2c"><noscript id="c8c2c"></noscript></tfoot>
          • <nav id="c8c2c"><sup id="c8c2c"></sup></nav>
            <tr id="c8c2c"></tr>