Seeing with sound, a 30 minute radio programme by David Attenborough about the way bats, dolphins and whales use sound waves to "see" their environment.Click on the "listen to latest show" and go to sunday sequence http://www.rte.ie/lyricfm/sundaysequence/ You need realplayer to play it. -- Want an e-mail address like mine? Get a free e-mail account today at www.mail.com!