The death toll was like nothing Stephen Maciejewski had ever seen. Early on October 2, 2020, the 约炮视频 Mid-Atlantic volunteer began scooping up bird carcasses dotting Philadelphia streets for scientific collection. He put each one in a separate plastic bag and labeled them—date, time, location of death—until he ran out of bags. Overwhelmed, he phoned Keith Russell, the organization’s urban conservation program manager, who came to help. It was peak migration season, and the victims, attracted by nighttime lights, had collided with buildings. In all, the official single-day death toll estimates topped 1,000 birds, with many thousands more likely unaccounted for. They are among the hundreds of millions—mostly migrants—estimated to die from such collisions in the United States annually. Using the data and photos from that morning, Maciejewski and Russell inspired an article in the Philadelphia Inquirer. From there, the story spread to media outlets in other states and...