The message will look like this:
(sender) is sending you a link via vogelstimmen.de to the following birdsong:
Black-chinned Sparrow: http://animaldiversity.org/collections/contributors/naturesongs/bcsp1/file.mp3
http://www.vogelstimmen.de is a search engine providing quick and easy access to free recordings of birdsongs and calls on the Internet. Our database offers several thousand links to recordings of all kinds of bird sounds, all of which can be listened to online. Anyone can learn to identify birds by using our search engine or the CDs available at http://www.vogelstimmen.de/html/shop.php?lang=2.