In France, Jean Labadie’s Bac Films is preparing to roll out a big-screen nature documentary about bird migration. Traveling Birds was produced for 150 million francs (about $20 million) and will open on 400 prints on December 12. The chosen date places the film squarely between two blockbuster releases: Harry Potter and The Lord of the Rings. Bac has budgeted roughly $1.6 million for...