Human activities and the built environment are an important cause. This project studies the risks migratory birds face in Chicagoland—both on the ground and in the air. Working with partners across the region, we are (1) exploring how migratory birds use aerial habitats high above the city, (2) characterizing the value of urban green spaces, and (3) identifying the most important factors driving fatal bird-building collisions. Armed with this new understanding, we will develop data-driven tools for use by advocates and policymakers and engage and educate the public about the inspiring phenomenon of bird migration and what they can do to help.