Some of Canadian filmmaker Su Rynard's fondest memories revolve around birds. As a child she spent hours being mesmerized by Barn Swallows, Cedar Waxwings, and Evening Grosbeaks at her family’s cottage, a few hours north of Toronto—all while her mother scribbled down notes in the margins of an 蜜柚APP field guide. At night, Rynard says the songs of Eastern Whip-poor-wills often lulled her to sleep. But as she grew up and stayed in Toronto to pursue film and video, Rynard saw and heard fewer birds. After reading Bridget Stutchbury’s 2009 book Silence of the Songbirds, which traces the migration of many species and tells of all the ways they can perish, she realized the sorry state of songbirds worldwide, and felt compelled to take action. So, in 2011, Rynard teamed up with producers Dianne Woods and Joanne Jackson to form SongBirdSOS Productions—a movie company dedicated exclusively to chronicling the intricate bond between humans and birds. “Humans especially have...