Natural History Wanderings

In learning about birding by sound this last year, I have often heard and experienced that if see the bird making the sound it makes a greater imprint on your memory.  Rob Sheppard in a posting on his blog Nature and Photography had a posting about a new e-book by Marie Read and Lang Eliot, Music of the Birds Vol 1. (http://www.natureandphotography.com/?p=1042) The book has photos and videos of birds with their songs. At present it is only available for iPads.