Research on Song Sparrows. Melospiza melodia on Brackman Island
Dr. Liana Zanette, Associate Professor in the Dept. of Biology , University of Western Ontario has done research on “Perceived Predation Risk Reduces the Number of Offspring Songbirds Produce per Year”.
Her website for Zanette Lab carries the most recent research article and has links to excellent images of Song sparrows and their predators, and a video which was made during the research,