Post date: Jul 14, 2019 4:43:55 AM
Animal Sound Archive at the Museum für Naturkunde Berlin. One of the oldest and most comprehensive collection of animal sound recordings in the world. It comprises approximately 120,000 sound recordings including 1,800 bird species, 580 mammal species and numerous fish, amphibian, reptile and insect species. <http://www.animalsoundarchive.org>
Macaulay Library at the Cornell Lab of Ornithology. The media site for bird media since 1929. <https://search.macaulaylibrary.org/catalog>
xeno-canto is a website dedicated to sharing bird sounds from all over the world <https://www.xeno-canto.org/>.
Universitat Pompeu Fabra. Repository of sound under the creative commons license, Freesound.org,<http://www.freesound.org/> has a large database of sounds that are licensed under Creative Commons.
Bird Audio Detection challenge at Queen Mary University of London <http://machine-listening.eecs.qmul.ac.uk/bird-audio-detection-challenge/>
iNaturalist <https://www.inaturalist.org>
Bird Recordings at Avisoft Bioacoustics, Germany. Probably not open-source. <http://www.avisoft.com/sounds.htm>
More here (not necessarily research quality): https://www.online-tech-tips.com/computer-tips/free-sound-effects/