Acknowledgments
This work was made possible by support from the Wolfson Foundation to M.S.,
National Geographic to K.R. (WW202R-17) and an NSF CAREER to K.R. (1942313). This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant ACI-1548562. We also thank the many people who assisted in sample collection, including the many volunteers and field technicians associated with The Institute for Bird Populations’ Monitoring Avian Productivity and Survival (MAPS) and Monitoring Neotropical Migrants in Winter (MoSI) programs.