This set consists of digitized sound recordings of animal sound (mostly birds), which were produced and published for purposes of popular entertainment, teaching, hunting, and scientific research in ornithology and bioacoustics. The collection includes recordings gathered and digitized by historians of science Jackson Pope, Joeri Bruyninckx, and Alexandra Hui. The majority of recordings was produced between 1950 and 1975 by professional and semi-professional field recordists in the United States, Canada, and Britain.