Songbird's duets not so harmonious</tile> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta http-equiv="description" content="Songbird's duets not so harmonious"> <meta http-equiv="keywords" content="Songbirds,duets,not,so,harmonious"> </head> <body> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="10" height="39"> </td> <td width="99%" height="39"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="16%"><a href="http://inttranews.inttra.net"><img src="http://inttranews.inttra.net/images/inttranews_grey_2.jpg" width="192" height="37" border="0"></a></td> <td width="50%" valign="middle"> <p><font face="Arial, Helvetica, sans-serif" size="2"><b><font color="#CCCCCC" face="Verdana, Arial, Helvetica, sans-serif" size="1">KNOW.<br> HOW.</font></b></font> </p> </td> <td width="34%" align="right" valign="top"><font face="Verdana, Arial, Helvetica, sans-serif" size="1" color="#666666">08-09-2008</font></td> </tr> </table> </td> </tr> <tr> <td width="10"> </td> <td width="99%" > </td> </tr> <tr> <td width="10"> </td> <td width="99%" > <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b>Songbird's duets not so harmonious</b></font> </td> </tr> <tr> <td width="100%"> </td> </tr> <tr> <td width="100%"> <img src="http://inttranews.inttra.net/img_news/img_R9Bvi0EdwloO5uZeZm8y_0.jpg" align="left" vspace="5" hspace="5" ><font face="Verdana, Arial, Helvetica, sans-serif" size="2">San José, Costa Rica (MSNBC): Harmonious bird songs may sound pleasant to people, but a new study has found that at least some birds fight by singing, using melodic tweets to defend their relationships and territories. The study, published in the latest issue of Current Biology, was made possible by eight microphones positioned strategically throughout the dense tropical forests of Costa Rica. <br> <br>For more information, please visit: <br><a href="http://www.msnbc.msn.com/id/26545307/ " target="blank">www.msnbc.msn.com/id/26545307/ </a></font></td> </tr> </table> </td></tr> </table> <script type="text/javascript"></script> <script type="text/javascript" src="<http://pagead2.googlesyndication.com/pagead/show