Light from human things is bad for animals in the sky that fly at night.
Andrew Farnsworth1, Kyle G Horton2, Adriaan M Dokter3, Benjamin M Van Doren4 and Cecilia Nilsson3, (1)Cornell University, Ithaca, NY, United States, (2)Colorado State University, Fort Collins, United States, (3)Cornell University, Ithaca, United States, (4)Oxford University, Cambridge, United Kingdom
