As written about in the new issue of The Wire by Francis Gooding, a massive public archive - anyone can upload or download - of bird song from all around the world: Xeno-Canto
396735 recordings! 9830 species! Nearly 6200 hours worth!
I reckon they should start a special subsection for musical compositions based on bird song - samples or transcribed melodies.
That's my excuse to post this again:
Would dearly love to get the rest of this cassette by Ron Nagorcka - Lovregana: Music From A Tasmanian Forest - anybody got it?