NatureSongs.com
More than 1000 digitally recorded natural sounds and photos can be downloaded.
www.naturesongs.com/

NatureSounds.org
The website of Nature Sounds Society.
www.naturesounds.org/

Nature's Music
Relax with nature sounds. Instrumental and ambient music recordings with the nature sounds of wildlife, ambient soundscapes, whales, birds and more.
www.naturesmusic.com/