Cheryl Tipp is Curator of Wildlife and Environmental Sounds at the British Library. She talks about the conservation applications of sound, and the availability of sounds in the archive.
This is Episode C of Conservation Sound.
The natural history sounds are from the British Wildlife Recordings playlist, used under Creative Commons with attribution:
A recent blogpost by Cheryl about the audio being made available as Creative Commons. http://britishlibrary.typepad.co.uk/sound-and-vision/2015/04/british-wildlife-recordings-on-the-move.html