The documentary film The Birds Did Not Fly was made in 1999, when it was still possible to talk to ninety-year-olds who were children during the Isonzo Front. A narrative about war was created, which speaks more about life than about death and about that primal instinct that drives us to help living beings in need. Their memories of the beginning of the war, of going into exile and of returning to their destroyed homes are full of such life-filled moments. The research guide for the film was the publication Pregnani (eng. Exiled), in which the author Vili Prinčič collected the memories of Gorizia refugees from the First World War. Their testimonies in the film are complemented by family photographs and other written sources; the notes of the Austrian war correspondent Alice Schalek, the diary of Lucie Bortolotti from Gorizia, the memoirs of the writer Alojzij Res and articles from the daily newspaper of the time. Archival footage of the destroyed Gorizia and photographs of the razed surrounding villages are also valuable documents.