Bird songs

My favourite sites:

The Virtual Bird - bird photographs, videos & songs
Sound Gallery - in RealAudio, by the Dutch Birding Association
CNR - in RealAudio, by the Dutch bioacoustical Association (Club voor Natuurgeluiden Registratie)
Animal Sound Recordings - wav-format, by Raimund Specht
Lær fuglenes stemmer - wav-format, species ordered by Danish name
Wildlife Sounds - in RealAudio
Naturesongs - in wav-format. North American and Costa Rican birds
Guide to Animal Sounds on the Net - species specific links to sounds on other websites
Online Sounds and Songs of Birds - links to bird songs on other websites
Bioacoustics Research Program - at Cornell Lab of Ornithology
Greg Kunkel's Bird songs - a collection of sonagrams, and instructions how to make them
P2-fåglar - in RealAudio, from Sveriges Radio (in Swedish)
Vogels en zoogdieren van West- en Midden Europa - in Dutch