For starters:
The British Library site has a lot of useful basic information on equipment and techniques for wildlife sound recording:
http://www.bl.uk/collections/sound-archive/wiltrain.html
The Macaulay Library of Cornell University also has a very impressive collection of recordings of bird calls. Most are from North America, as you might expect, but there is a searchable archive which has quite a number of entries from this region, mostly recorded in Taiwan, it seems
http://www.birds.cornell.edu/macaulaylibrary/
