HydrogenAudio

After 12 years of work, Cornell's Macaulay Library archive, the largest collection of wildlife sounds in the world, is now digitized and fully available online.
more... (http://www.news.cornell.edu/stories/Jan13/MacaulayDigital.html)

Link: http://macaulaylibrary.org (http://macaulaylibrary.org)

I found this quite interesting, and thought that maybe other users will find it too.
Quality varies obviously, but POV is magical