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‘40,000 birds later’ In 1978, Willard, the Field Museum’s collections manager emeritus, heard an offhand remark about birds hitting the McCormick Place, North America’s largest convention center, which is a mile south of the museum. So, he investigated. “I went down early one morning, just out of curiosity, and wandered around and actually found four or five dead birds,” Willard says. “I might not have gone back if I hadn’t found anything that first day, and now here we are, 40 years later and 40,000 birds later.” Willard and his colleagues, including Field Museum coauthor Mary Hennen and volunteers from the Chicago Bird Collision Monitors, have visited the site every day before sunrise during migration season, sometimes as early as 3:30 in the morning.

United statesLake michiganMccormick placeDavid willardBenjamin van dorenVan dorenMary hennenDoug stotzMccormick centerCornell lab of ornithologyProceedings of the national academy sciencesUniversity of michigan departmentKyle horton at colorado state universityField museumMuseum of zoologyCornell lab